diff --git a/wm-production/src/main/java/com/water/production/controller/ChemicalDosingController.java b/wm-production/src/main/java/com/water/production/controller/ChemicalDosingController.java
new file mode 100644
index 00000000..c8cfa75d
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/controller/ChemicalDosingController.java
@@ -0,0 +1,172 @@
+package com.water.production.controller;
+
+import com.water.common.core.result.R;
+import com.water.production.entity.ChemicalDosing;
+import com.water.production.entity.ChemicalStock;
+import com.water.production.entity.DosingStrategy;
+import com.water.production.service.ChemicalDosingService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 全工艺药剂投加监控 Controller
+ * 混凝→沉淀→过滤→消毒 全流程药剂管理
+ */
+@Tag(name = "药剂投加监控")
+@RestController
+@RequestMapping("/api/production/chemical")
+@RequiredArgsConstructor
+public class ChemicalDosingController {
+
+    private final ChemicalDosingService chemicalDosingService;
+
+    // ==================== 1. 投加监控 ====================
+
+    @Operation(summary = "投加记录分页列表")
+    @GetMapping("/dosing/list")
+    public R<Map<String, Object>> listDosing(
+            @RequestParam(defaultValue = "1") int page,
+            @RequestParam(defaultValue = "20") int size,
+            @RequestParam(required = false) String processStage,
+            @RequestParam(required = false) String station,
+            @RequestParam(required = false) String status) {
+        return R.ok(chemicalDosingService.listDosing(page, size, processStage, station, status));
+    }
+
+    @Operation(summary = "投加记录详情")
+    @GetMapping("/dosing/{id}")
+    public R<ChemicalDosing> getDosing(@PathVariable Long id) {
+        ChemicalDosing dosing = chemicalDosingService.getDosingById(id);
+        return dosing != null ? R.ok(dosing) : R.fail(404, "记录不存在");
+    }
+
+    @Operation(summary = "新增投加记录")
+    @PostMapping("/dosing")
+    public R<ChemicalDosing> createDosing(@RequestBody ChemicalDosing dosing) {
+        return R.ok(chemicalDosingService.createDosing(dosing));
+    }
+
+    @Operation(summary = "更新投加记录")
+    @PutMapping("/dosing/{id}")
+    public R<Boolean> updateDosing(@PathVariable Long id, @RequestBody ChemicalDosing dosing) {
+        return R.ok(chemicalDosingService.updateDosing(id, dosing));
+    }
+
+    @Operation(summary = "删除投加记录")
+    @DeleteMapping("/dosing/{id}")
+    public R<Boolean> deleteDosing(@PathVariable Long id) {
+        return R.ok(chemicalDosingService.deleteDosing(id));
+    }
+
+    // ==================== 2. 投加记录 + 趋势分析 ====================
+
+    @Operation(summary = "投加历史记录列表")
+    @GetMapping("/record/list")
+    public R<Map<String, Object>> listRecords(
+            @RequestParam(defaultValue = "1") int page,
+            @RequestParam(defaultValue = "20") int size,
+            @RequestParam(required = false) String processStage,
+            @RequestParam(required = false) String chemicalName,
+            @RequestParam(required = false) String startTime,
+            @RequestParam(required = false) String endTime) {
+        return R.ok(chemicalDosingService.listRecords(page, size, processStage, chemicalName, startTime, endTime));
+    }
+
+    @Operation(summary = "投加趋势分析")
+    @GetMapping("/record/trend")
+    public R<List<Map<String, Object>>> trendAnalysis(
+            @RequestParam String processStage,
+            @RequestParam String startTime,
+            @RequestParam String endTime) {
+        return R.ok(chemicalDosingService.trendAnalysis(processStage, startTime, endTime));
+    }
+
+    // ==================== 3. 药耗统计 ====================
+
+    @Operation(summary = "药耗统计（日/周/月 + 单位产水药耗）")
+    @GetMapping("/statistics")
+    public R<Map<String, Object>> statistics(
+            @RequestParam(defaultValue = "day") String period,
+            @RequestParam(required = false) String station) {
+        return R.ok(chemicalDosingService.statistics(period, station));
+    }
+
+    // ==================== 4. 投加策略 ====================
+
+    @Operation(summary = "投加策略列表")
+    @GetMapping("/strategy/list")
+    public R<List<DosingStrategy>> listStrategies(
+            @RequestParam(required = false) String processStage,
+            @RequestParam(required = false) Boolean enabled) {
+        return R.ok(chemicalDosingService.listStrategies(processStage, enabled));
+    }
+
+    @Operation(summary = "投加策略详情")
+    @GetMapping("/strategy/{id}")
+    public R<DosingStrategy> getStrategy(@PathVariable Long id) {
+        DosingStrategy strategy = chemicalDosingService.getStrategyById(id);
+        return strategy != null ? R.ok(strategy) : R.fail(404, "策略不存在");
+    }
+
+    @Operation(summary = "新增投加策略")
+    @PostMapping("/strategy")
+    public R<DosingStrategy> createStrategy(@RequestBody DosingStrategy strategy) {
+        return R.ok(chemicalDosingService.createStrategy(strategy));
+    }
+
+    @Operation(summary = "更新投加策略")
+    @PutMapping("/strategy/{id}")
+    public R<Boolean> updateStrategy(@PathVariable Long id, @RequestBody DosingStrategy strategy) {
+        return R.ok(chemicalDosingService.updateStrategy(id, strategy));
+    }
+
+    @Operation(summary = "删除投加策略")
+    @DeleteMapping("/strategy/{id}")
+    public R<Boolean> deleteStrategy(@PathVariable Long id) {
+        return R.ok(chemicalDosingService.deleteStrategy(id));
+    }
+
+    @Operation(summary = "计算推荐投加量（基于策略联动）")
+    @PostMapping("/strategy/{id}/calculate")
+    public R<Map<String, Object>> calculateRecommended(
+            @PathVariable Long id,
+            @RequestParam(required = false) BigDecimal turbidity,
+            @RequestParam(required = false) BigDecimal flow,
+            @RequestParam(required = false) BigDecimal ph) {
+        return R.ok(chemicalDosingService.calculateRecommendedDosing(id, turbidity, flow, ph));
+    }
+
+    // ==================== 5. 药剂库存 ====================
+
+    @Operation(summary = "库存列表")
+    @GetMapping("/stock/list")
+    public R<List<ChemicalStock>> listStocks(
+            @RequestParam(required = false) String station,
+            @RequestParam(required = false) String status) {
+        return R.ok(chemicalDosingService.listStocks(station, status));
+    }
+
+    @Operation(summary = "新增库存记录")
+    @PostMapping("/stock")
+    public R<ChemicalStock> createStock(@RequestBody ChemicalStock stock) {
+        return R.ok(chemicalDosingService.createStock(stock));
+    }
+
+    @Operation(summary = "更新库存")
+    @PutMapping("/stock/{id}")
+    public R<Boolean> updateStock(@PathVariable Long id, @RequestBody ChemicalStock stock) {
+        return R.ok(chemicalDosingService.updateStock(id, stock));
+    }
+
+    @Operation(summary = "低库存预警列表")
+    @GetMapping("/stock/low-alert")
+    public R<List<Map<String, Object>>> lowStockAlerts() {
+        return R.ok(chemicalDosingService.lowStockAlerts());
+    }
+}
diff --git a/wm-production/src/main/java/com/water/production/entity/ChemicalDosing.java b/wm-production/src/main/java/com/water/production/entity/ChemicalDosing.java
new file mode 100644
index 00000000..c8314393
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/entity/ChemicalDosing.java
@@ -0,0 +1,56 @@
+package com.water.production.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 药剂投加监控记录
+ * 各工艺段（混凝/沉淀/过滤/消毒）的药剂投加量实时监控
+ */
+@Data
+@TableName("prod_chemical_dosing")
+public class ChemicalDosing {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 工艺段: coagulation/sedimentation/filtration/disinfection */
+    private String processStage;
+
+    /** 药剂名称 */
+    private String chemicalName;
+
+    /** 药剂编码 */
+    private String chemicalCode;
+
+    /** 投加量(kg) */
+    private BigDecimal dosingAmount;
+
+    /** 投加速率(kg/h) */
+    private BigDecimal dosingRate;
+
+    /** 投加浓度(mg/L) */
+    private BigDecimal concentration;
+
+    /** 当时流量(m³/h) */
+    private BigDecimal flowRate;
+
+    /** 站点/水厂 */
+    private String station;
+
+    /** 操作员 */
+    private String operator;
+
+    /** 状态: active/paused/stopped */
+    private String status;
+
+    private String remark;
+
+    @TableField(fill = FieldFill.INSERT)
+    private LocalDateTime createdTime;
+
+    @TableField(fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updatedTime;
+}
diff --git a/wm-production/src/main/java/com/water/production/entity/ChemicalStock.java b/wm-production/src/main/java/com/water/production/entity/ChemicalStock.java
new file mode 100644
index 00000000..e0ae69d4
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/entity/ChemicalStock.java
@@ -0,0 +1,56 @@
+package com.water.production.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 药剂库存管理
+ */
+@Data
+@TableName("prod_chemical_stock")
+public class ChemicalStock {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 药剂名称 */
+    private String chemicalName;
+
+    /** 药剂编码 */
+    private String chemicalCode;
+
+    /** 当前库存(kg) */
+    private BigDecimal currentStock;
+
+    /** 最大库存 */
+    private BigDecimal maxStock;
+
+    /** 安全库存(低于此值预警) */
+    private BigDecimal minStock;
+
+    /** 单位 */
+    private String unit;
+
+    /** 仓库位置 */
+    private String warehouse;
+
+    /** 供应商 */
+    private String supplier;
+
+    /** 站点 */
+    private String station;
+
+    /** 状态: normal/low/out */
+    private String status;
+
+    /** 最近入库时间 */
+    private LocalDateTime lastInbound;
+
+    @TableField(fill = FieldFill.INSERT)
+    private LocalDateTime createdTime;
+
+    @TableField(fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updatedTime;
+}
diff --git a/wm-production/src/main/java/com/water/production/entity/DosingRecord.java b/wm-production/src/main/java/com/water/production/entity/DosingRecord.java
new file mode 100644
index 00000000..485611f8
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/entity/DosingRecord.java
@@ -0,0 +1,47 @@
+package com.water.production.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 投加历史记录（用于趋势分析）
+ */
+@Data
+@TableName("prod_dosing_record")
+public class DosingRecord {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 关联投加记录ID */
+    private Long dosingId;
+
+    /** 工艺段 */
+    private String processStage;
+
+    /** 药剂名称 */
+    private String chemicalName;
+
+    /** 投加量(kg) */
+    private BigDecimal dosingAmount;
+
+    /** 投加速率(kg/h) */
+    private BigDecimal dosingRate;
+
+    /** 投加浓度(mg/L) */
+    private BigDecimal concentration;
+
+    /** 当时流量(m³/h) */
+    private BigDecimal flowRate;
+
+    /** 站点 */
+    private String station;
+
+    /** 记录时间 */
+    private LocalDateTime recordTime;
+
+    @TableField(fill = FieldFill.INSERT)
+    private LocalDateTime createdTime;
+}
diff --git a/wm-production/src/main/java/com/water/production/entity/DosingStrategy.java b/wm-production/src/main/java/com/water/production/entity/DosingStrategy.java
new file mode 100644
index 00000000..d35beddc
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/entity/DosingStrategy.java
@@ -0,0 +1,67 @@
+package com.water.production.entity;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+import java.math.BigDecimal;
+import java.time.LocalDateTime;
+
+/**
+ * 自动投加策略配置（基于原水水质/流量联动）
+ */
+@Data
+@TableName("prod_dosing_strategy")
+public class DosingStrategy {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 策略名称 */
+    private String strategyName;
+
+    /** 工艺段 */
+    private String processStage;
+
+    /** 药剂名称 */
+    private String chemicalName;
+
+    /** 策略类型: auto/manual/semi-auto */
+    private String strategyType;
+
+    /** 基础投加速率 */
+    private BigDecimal baseDosingRate;
+
+    /** 最小投加速率 */
+    private BigDecimal minDosingRate;
+
+    /** 最大投加速率 */
+    private BigDecimal maxDosingRate;
+
+    /** 浊度阈值联动 */
+    private BigDecimal turbidityThreshold;
+
+    /** 流量阈值联动 */
+    private BigDecimal flowThreshold;
+
+    /** pH下限 */
+    private BigDecimal phThresholdMin;
+
+    /** pH上限 */
+    private BigDecimal phThresholdMax;
+
+    /** 投加公式 */
+    private String formula;
+
+    /** 是否启用 */
+    private Boolean enabled;
+
+    /** 站点 */
+    private String station;
+
+    private String remark;
+
+    @TableField(fill = FieldFill.INSERT)
+    private LocalDateTime createdTime;
+
+    @TableField(fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updatedTime;
+}
diff --git a/wm-production/src/main/java/com/water/production/mapper/ChemicalDosingMapper.java b/wm-production/src/main/java/com/water/production/mapper/ChemicalDosingMapper.java
new file mode 100644
index 00000000..e7b996b4
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/mapper/ChemicalDosingMapper.java
@@ -0,0 +1,28 @@
+package com.water.production.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.water.production.entity.ChemicalDosing;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
+import java.util.Map;
+
+@Mapper
+public interface ChemicalDosingMapper extends BaseMapper<ChemicalDosing> {
+
+    /** 按工艺段统计今日投加量 */
+    @Select("SELECT process_stage, chemical_name, SUM(dosing_amount) as total_amount " +
+            "FROM prod_chemical_dosing WHERE DATE(created_time) = CURRENT_DATE " +
+            "GROUP BY process_stage, chemical_name")
+    List<Map<String, Object>> dailyStatistics();
+
+    /** 按时间段统计药耗 */
+    @Select("SELECT process_stage, chemical_name, SUM(dosing_amount) as total_amount, " +
+            "COUNT(*) as record_count FROM prod_chemical_dosing " +
+            "WHERE created_time BETWEEN #{startTime} AND #{endTime} " +
+            "GROUP BY process_stage, chemical_name ORDER BY total_amount DESC")
+    List<Map<String, Object>> statisticsByPeriod(@Param("startTime") String startTime,
+                                                  @Param("endTime") String endTime);
+}
diff --git a/wm-production/src/main/java/com/water/production/mapper/ChemicalStockMapper.java b/wm-production/src/main/java/com/water/production/mapper/ChemicalStockMapper.java
new file mode 100644
index 00000000..0d450722
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/mapper/ChemicalStockMapper.java
@@ -0,0 +1,9 @@
+package com.water.production.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.water.production.entity.ChemicalStock;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface ChemicalStockMapper extends BaseMapper<ChemicalStock> {
+}
diff --git a/wm-production/src/main/java/com/water/production/mapper/DosingRecordMapper.java b/wm-production/src/main/java/com/water/production/mapper/DosingRecordMapper.java
new file mode 100644
index 00000000..1db85e60
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/mapper/DosingRecordMapper.java
@@ -0,0 +1,24 @@
+package com.water.production.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.water.production.entity.DosingRecord;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
+import java.util.Map;
+
+@Mapper
+public interface DosingRecordMapper extends BaseMapper<DosingRecord> {
+
+    /** 趋势分析：按小时聚合投加量 */
+    @Select("SELECT DATE_TRUNC('hour', record_time) as time_bucket, " +
+            "AVG(dosing_rate) as avg_rate, SUM(dosing_amount) as total_amount " +
+            "FROM prod_dosing_record WHERE process_stage = #{stage} " +
+            "AND record_time BETWEEN #{startTime} AND #{endTime} " +
+            "GROUP BY time_bucket ORDER BY time_bucket")
+    List<Map<String, Object>> trendByHour(@Param("stage") String stage,
+                                           @Param("startTime") String startTime,
+                                           @Param("endTime") String endTime);
+}
diff --git a/wm-production/src/main/java/com/water/production/mapper/DosingStrategyMapper.java b/wm-production/src/main/java/com/water/production/mapper/DosingStrategyMapper.java
new file mode 100644
index 00000000..7add9a3e
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/mapper/DosingStrategyMapper.java
@@ -0,0 +1,9 @@
+package com.water.production.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.water.production.entity.DosingStrategy;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface DosingStrategyMapper extends BaseMapper<DosingStrategy> {
+}
diff --git a/wm-production/src/main/java/com/water/production/service/ChemicalDosingService.java b/wm-production/src/main/java/com/water/production/service/ChemicalDosingService.java
new file mode 100644
index 00000000..7fcaadbf
--- /dev/null
+++ b/wm-production/src/main/java/com/water/production/service/ChemicalDosingService.java
@@ -0,0 +1,308 @@
+package com.water.production.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.water.production.entity.ChemicalDosing;
+import com.water.production.entity.ChemicalStock;
+import com.water.production.entity.DosingRecord;
+import com.water.production.entity.DosingStrategy;
+import com.water.production.mapper.ChemicalDosingMapper;
+import com.water.production.mapper.ChemicalStockMapper;
+import com.water.production.mapper.DosingRecordMapper;
+import com.water.production.mapper.DosingStrategyMapper;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * 全工艺药剂投加监控服务
+ * 涵盖混凝→沉淀→过滤→消毒全流程
+ */
+@Service
+@RequiredArgsConstructor
+public class ChemicalDosingService {
+
+    private final ChemicalDosingMapper dosingMapper;
+    private final DosingRecordMapper recordMapper;
+    private final ChemicalStockMapper stockMapper;
+    private final DosingStrategyMapper strategyMapper;
+
+    // ==================== 药剂投加监控 ====================
+
+    /** 分页查询投加记录 */
+    public Map<String, Object> listDosing(int page, int size, String processStage, String station, String status) {
+        LambdaQueryWrapper<ChemicalDosing> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(StringUtils.hasText(processStage), ChemicalDosing::getProcessStage, processStage)
+               .eq(StringUtils.hasText(station), ChemicalDosing::getStation, station)
+               .eq(StringUtils.hasText(status), ChemicalDosing::getStatus, status)
+               .orderByDesc(ChemicalDosing::getCreatedTime);
+        Page<ChemicalDosing> result = dosingMapper.selectPage(new Page<>(page, size), wrapper);
+        Map<String, Object> data = new HashMap<>();
+        data.put("records", result.getRecords());
+        data.put("total", result.getTotal());
+        data.put("pages", result.getPages());
+        return data;
+    }
+
+    /** 获取投加详情 */
+    public ChemicalDosing getDosingById(Long id) {
+        return dosingMapper.selectById(id);
+    }
+
+    /** 新增投加记录 */
+    public ChemicalDosing createDosing(ChemicalDosing dosing) {
+        if (dosing.getStatus() == null) {
+            dosing.setStatus("active");
+        }
+        dosing.setCreatedTime(LocalDateTime.now());
+        dosing.setUpdatedTime(LocalDateTime.now());
+        dosingMapper.insert(dosing);
+        saveDosingRecord(dosing);
+        return dosing;
+    }
+
+    /** 更新投加记录 */
+    public boolean updateDosing(Long id, ChemicalDosing dosing) {
+        dosing.setId(id);
+        dosing.setUpdatedTime(LocalDateTime.now());
+        int rows = dosingMapper.updateById(dosing);
+        if (rows > 0) {
+            saveDosingRecord(dosing);
+        }
+        return rows > 0;
+    }
+
+    /** 删除投加记录 */
+    public boolean deleteDosing(Long id) {
+        return dosingMapper.deleteById(id) > 0;
+    }
+
+    // ==================== 投加记录 + 趋势分析 ====================
+
+    /** 投加记录列表 */
+    public Map<String, Object> listRecords(int page, int size, String processStage, String chemicalName,
+                                            String startTime, String endTime) {
+        LambdaQueryWrapper<DosingRecord> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(StringUtils.hasText(processStage), DosingRecord::getProcessStage, processStage)
+               .eq(StringUtils.hasText(chemicalName), DosingRecord::getChemicalName, chemicalName);
+        if (StringUtils.hasText(startTime)) {
+            wrapper.ge(DosingRecord::getRecordTime, LocalDateTime.parse(startTime, DateTimeFormatter.ISO_LOCAL_DATE_TIME));
+        }
+        if (StringUtils.hasText(endTime)) {
+            wrapper.le(DosingRecord::getRecordTime, LocalDateTime.parse(endTime, DateTimeFormatter.ISO_LOCAL_DATE_TIME));
+        }
+        wrapper.orderByDesc(DosingRecord::getRecordTime);
+        Page<DosingRecord> result = recordMapper.selectPage(new Page<>(page, size), wrapper);
+        Map<String, Object> data = new HashMap<>();
+        data.put("records", result.getRecords());
+        data.put("total", result.getTotal());
+        return data;
+    }
+
+    /** 趋势分析 */
+    public List<Map<String, Object>> trendAnalysis(String processStage, String startTime, String endTime) {
+        return recordMapper.trendByHour(processStage, startTime, endTime);
+    }
+
+    // ==================== 药耗统计 ====================
+
+    /** 药耗统计：日/周/月 + 单位产水药耗 */
+    public Map<String, Object> statistics(String period, String station) {
+        LocalDateTime now = LocalDateTime.now();
+        LocalDateTime start;
+        LocalDateTime end = now;
+
+        switch (period != null ? period : "day") {
+            case "week":
+                start = now.minusWeeks(1);
+                break;
+            case "month":
+                start = now.minusMonths(1);
+                break;
+            default:
+                start = now.minusDays(1);
+        }
+
+        String startTime = start.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
+        String endTime = end.format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
+        List<Map<String, Object>> rawStats = dosingMapper.statisticsByPeriod(startTime, endTime);
+
+        if (StringUtils.hasText(station)) {
+            rawStats = rawStats.stream()
+                    .filter(m -> station.equals(m.get("station")))
+                    .collect(Collectors.toList());
+        }
+
+        BigDecimal totalAmount = rawStats.stream()
+                .map(m -> m.get("total_amount") != null ? new BigDecimal(m.get("total_amount").toString()) : BigDecimal.ZERO)
+                .reduce(BigDecimal.ZERO, BigDecimal::add);
+
+        Map<String, Object> result = new HashMap<>();
+        result.put("period", period);
+        result.put("details", rawStats);
+        result.put("totalAmount", totalAmount.setScale(4, RoundingMode.HALF_UP));
+        result.put("unitConsumption", calculateUnitConsumption(totalAmount, start, end));
+        return result;
+    }
+
+    private BigDecimal calculateUnitConsumption(BigDecimal totalAmount, LocalDateTime start, LocalDateTime end) {
+        long hours = java.time.Duration.between(start, end).toHours();
+        if (hours <= 0) hours = 1;
+        BigDecimal totalWater = BigDecimal.valueOf(hours * 100L);
+        return totalAmount.divide(totalWater, 6, RoundingMode.HALF_UP);
+    }
+
+    // ==================== 投加策略 ====================
+
+    public List<DosingStrategy> listStrategies(String processStage, Boolean enabled) {
+        LambdaQueryWrapper<DosingStrategy> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(StringUtils.hasText(processStage), DosingStrategy::getProcessStage, processStage)
+               .eq(enabled != null, DosingStrategy::getEnabled, enabled)
+               .orderByAsc(DosingStrategy::getProcessStage);
+        return strategyMapper.selectList(wrapper);
+    }
+
+    public DosingStrategy getStrategyById(Long id) {
+        return strategyMapper.selectById(id);
+    }
+
+    public DosingStrategy createStrategy(DosingStrategy strategy) {
+        strategy.setCreatedTime(LocalDateTime.now());
+        strategy.setUpdatedTime(LocalDateTime.now());
+        if (strategy.getEnabled() == null) strategy.setEnabled(true);
+        strategyMapper.insert(strategy);
+        return strategy;
+    }
+
+    public boolean updateStrategy(Long id, DosingStrategy strategy) {
+        strategy.setId(id);
+        strategy.setUpdatedTime(LocalDateTime.now());
+        return strategyMapper.updateById(strategy) > 0;
+    }
+
+    public boolean deleteStrategy(Long id) {
+        return strategyMapper.deleteById(id) > 0;
+    }
+
+    /** 根据策略计算推荐投加量 */
+    public Map<String, Object> calculateRecommendedDosing(Long strategyId, BigDecimal currentTurbidity,
+                                                           BigDecimal currentFlow, BigDecimal currentPh) {
+        DosingStrategy strategy = strategyMapper.selectById(strategyId);
+        if (strategy == null || !Boolean.TRUE.equals(strategy.getEnabled())) {
+            return Map.of("error", "策略不存在或未启用");
+        }
+
+        BigDecimal recommendedRate = strategy.getBaseDosingRate() != null ? strategy.getBaseDosingRate() : BigDecimal.ZERO;
+
+        if (currentTurbidity != null && strategy.getTurbidityThreshold() != null) {
+            if (currentTurbidity.compareTo(strategy.getTurbidityThreshold()) > 0) {
+                BigDecimal factor = currentTurbidity.divide(strategy.getTurbidityThreshold(), 4, RoundingMode.HALF_UP);
+                recommendedRate = recommendedRate.multiply(factor);
+            }
+        }
+
+        if (currentFlow != null && strategy.getFlowThreshold() != null) {
+            if (currentFlow.compareTo(strategy.getFlowThreshold()) > 0) {
+                BigDecimal flowFactor = currentFlow.divide(strategy.getFlowThreshold(), 4, RoundingMode.HALF_UP);
+                recommendedRate = recommendedRate.multiply(flowFactor);
+            }
+        }
+
+        if (strategy.getMinDosingRate() != null) {
+            recommendedRate = recommendedRate.max(strategy.getMinDosingRate());
+        }
+        if (strategy.getMaxDosingRate() != null) {
+            recommendedRate = recommendedRate.min(strategy.getMaxDosingRate());
+        }
+
+        Map<String, Object> result = new HashMap<>();
+        result.put("strategyId", strategyId);
+        result.put("strategyName", strategy.getStrategyName());
+        result.put("recommendedRate", recommendedRate.setScale(4, RoundingMode.HALF_UP));
+        result.put("chemicalName", strategy.getChemicalName());
+        result.put("processStage", strategy.getProcessStage());
+        return result;
+    }
+
+    // ==================== 药剂库存 ====================
+
+    public List<ChemicalStock> listStocks(String station, String status) {
+        LambdaQueryWrapper<ChemicalStock> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(StringUtils.hasText(station), ChemicalStock::getStation, station)
+               .eq(StringUtils.hasText(status), ChemicalStock::getStatus, status)
+               .orderByAsc(ChemicalStock::getStatus);
+        return stockMapper.selectList(wrapper);
+    }
+
+    public ChemicalStock createStock(ChemicalStock stock) {
+        stock.setCreatedTime(LocalDateTime.now());
+        stock.setUpdatedTime(LocalDateTime.now());
+        updateStockStatus(stock);
+        stockMapper.insert(stock);
+        return stock;
+    }
+
+    public boolean updateStock(Long id, ChemicalStock stock) {
+        stock.setId(id);
+        stock.setUpdatedTime(LocalDateTime.now());
+        updateStockStatus(stock);
+        return stockMapper.updateById(stock) > 0;
+    }
+
+    public List<Map<String, Object>> lowStockAlerts() {
+        LambdaQueryWrapper<ChemicalStock> wrapper = new LambdaQueryWrapper<>();
+        wrapper.eq(ChemicalStock::getStatus, "low").or().eq(ChemicalStock::getStatus, "out");
+        List<ChemicalStock> lowStocks = stockMapper.selectList(wrapper);
+
+        return lowStocks.stream().map(s -> {
+            Map<String, Object> alert = new HashMap<>();
+            alert.put("id", s.getId());
+            alert.put("chemicalName", s.getChemicalName());
+            alert.put("currentStock", s.getCurrentStock());
+            alert.put("minStock", s.getMinStock());
+            alert.put("status", s.getStatus());
+            alert.put("station", s.getStation());
+            alert.put("warehouse", s.getWarehouse());
+            BigDecimal deficit = s.getMinStock() != null && s.getCurrentStock() != null
+                    ? s.getMinStock().subtract(s.getCurrentStock()) : BigDecimal.ZERO;
+            alert.put("deficit", deficit.max(BigDecimal.ZERO));
+            return alert;
+        }).collect(Collectors.toList());
+    }
+
+    private void updateStockStatus(ChemicalStock stock) {
+        if (stock.getCurrentStock() == null || stock.getMinStock() == null) {
+            stock.setStatus("normal");
+            return;
+        }
+        if (stock.getCurrentStock().compareTo(BigDecimal.ZERO) <= 0) {
+            stock.setStatus("out");
+        } else if (stock.getCurrentStock().compareTo(stock.getMinStock()) < 0) {
+            stock.setStatus("low");
+        } else {
+            stock.setStatus("normal");
+        }
+    }
+
+    private void saveDosingRecord(ChemicalDosing dosing) {
+        DosingRecord record = new DosingRecord();
+        record.setDosingId(dosing.getId());
+        record.setProcessStage(dosing.getProcessStage());
+        record.setChemicalName(dosing.getChemicalName());
+        record.setDosingAmount(dosing.getDosingAmount());
+        record.setDosingRate(dosing.getDosingRate());
+        record.setConcentration(dosing.getConcentration());
+        record.setFlowRate(dosing.getFlowRate());
+        record.setStation(dosing.getStation());
+        record.setRecordTime(LocalDateTime.now());
+        record.setCreatedTime(LocalDateTime.now());
+        recordMapper.insert(record);
+    }
+}
diff --git a/wm-production/src/test/java/com/water/production/service/ChemicalDosingServiceTest.java b/wm-production/src/test/java/com/water/production/service/ChemicalDosingServiceTest.java
new file mode 100644
index 00000000..0b7b7678
--- /dev/null
+++ b/wm-production/src/test/java/com/water/production/service/ChemicalDosingServiceTest.java
@@ -0,0 +1,218 @@
+package com.water.production.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.water.production.entity.ChemicalDosing;
+import com.water.production.entity.ChemicalStock;
+import com.water.production.entity.DosingStrategy;
+import com.water.production.mapper.ChemicalDosingMapper;
+import com.water.production.mapper.ChemicalStockMapper;
+import com.water.production.mapper.DosingRecordMapper;
+import com.water.production.mapper.DosingStrategyMapper;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.*;
+
+/**
+ * ChemicalDosingService 单元测试
+ * 测试药剂投加监控、库存管理、投加策略计算等核心逻辑
+ */
+class ChemicalDosingServiceTest {
+
+    private ChemicalDosingService service;
+    private ChemicalDosingMapper dosingMapper;
+    private DosingRecordMapper recordMapper;
+    private ChemicalStockMapper stockMapper;
+    private DosingStrategyMapper strategyMapper;
+
+    @BeforeEach
+    void setUp() {
+        dosingMapper = mock(ChemicalDosingMapper.class);
+        recordMapper = mock(DosingRecordMapper.class);
+        stockMapper = mock(ChemicalStockMapper.class);
+        strategyMapper = mock(DosingStrategyMapper.class);
+        service = new ChemicalDosingService(dosingMapper, recordMapper, stockMapper, strategyMapper);
+    }
+
+    @Test
+    @DisplayName("测试新增投加记录 - 自动同步历史记录")
+    void testCreateDosing_autoSyncRecord() {
+        ChemicalDosing dosing = new ChemicalDosing();
+        dosing.setProcessStage("coagulation");
+        dosing.setChemicalName("聚合氯化铝");
+        dosing.setDosingAmount(new BigDecimal("10.5"));
+        dosing.setDosingRate(new BigDecimal("2.5"));
+        dosing.setStation("一水厂");
+
+        when(dosingMapper.insert(any())).thenReturn(1);
+        when(recordMapper.insert(any())).thenReturn(1);
+
+        ChemicalDosing result = service.createDosing(dosing);
+
+        assertNotNull(result);
+        assertEquals("active", result.getStatus());
+        assertNotNull(result.getCreatedTime());
+        verify(dosingMapper).insert(dosing);
+        verify(recordMapper).insert(any());
+    }
+
+    @Test
+    @DisplayName("测试删除投加记录")
+    void testDeleteDosing() {
+        when(dosingMapper.deleteById(1L)).thenReturn(1);
+        when(dosingMapper.deleteById(999L)).thenReturn(0);
+
+        assertTrue(service.deleteDosing(1L));
+        assertFalse(service.deleteDosing(999L));
+    }
+
+    @Test
+    @DisplayName("测试库存状态自动更新 - 低库存预警")
+    void testStockStatusAutoUpdate_low() {
+        ChemicalStock stock = new ChemicalStock();
+        stock.setChemicalName("次氯酸钠");
+        stock.setCurrentStock(new BigDecimal("50"));
+        stock.setMinStock(new BigDecimal("100"));
+        stock.setStation("一水厂");
+
+        when(stockMapper.insert(any())).thenReturn(1);
+
+        ChemicalStock result = service.createStock(stock);
+        assertEquals("low", result.getStatus());
+        verify(stockMapper).insert(stock);
+    }
+
+    @Test
+    @DisplayName("测试库存状态自动更新 - 缺货")
+    void testStockStatusAutoUpdate_out() {
+        ChemicalStock stock = new ChemicalStock();
+        stock.setChemicalName("聚合氯化铝");
+        stock.setCurrentStock(BigDecimal.ZERO);
+        stock.setMinStock(new BigDecimal("100"));
+
+        when(stockMapper.insert(any())).thenReturn(1);
+
+        ChemicalStock result = service.createStock(stock);
+        assertEquals("out", result.getStatus());
+    }
+
+    @Test
+    @DisplayName("测试库存状态自动更新 - 正常")
+    void testStockStatusAutoUpdate_normal() {
+        ChemicalStock stock = new ChemicalStock();
+        stock.setChemicalName("聚丙烯酰胺");
+        stock.setCurrentStock(new BigDecimal("500"));
+        stock.setMinStock(new BigDecimal("100"));
+
+        when(stockMapper.insert(any())).thenReturn(1);
+
+        ChemicalStock result = service.createStock(stock);
+        assertEquals("normal", result.getStatus());
+    }
+
+    @Test
+    @DisplayName("测试策略推荐投加量计算 - 浊度联动")
+    void testCalculateRecommended_turbidityLinkage() {
+        DosingStrategy strategy = new DosingStrategy();
+        strategy.setId(1L);
+        strategy.setStrategyName("混凝自动投加");
+        strategy.setProcessStage("coagulation");
+        strategy.setChemicalName("聚合氯化铝");
+        strategy.setEnabled(true);
+        strategy.setBaseDosingRate(new BigDecimal("10.0"));
+        strategy.setTurbidityThreshold(new BigDecimal("5.0"));
+        strategy.setMinDosingRate(new BigDecimal("5.0"));
+        strategy.setMaxDosingRate(new BigDecimal("50.0"));
+
+        when(strategyMapper.selectById(1L)).thenReturn(strategy);
+
+        // 浊度=10 > 阈值5, 因子=2, 推荐=10*2=20
+        Map<String, Object> result = service.calculateRecommendedDosing(
+                1L, new BigDecimal("10.0"), null, null);
+
+        assertNotNull(result);
+        assertEquals("聚合氯化铝", result.get("chemicalName"));
+        BigDecimal rate = (BigDecimal) result.get("recommendedRate");
+        assertEquals(0, rate.compareTo(new BigDecimal("20.0000")));
+    }
+
+    @Test
+    @DisplayName("测试策略推荐投加量计算 - 超出最大值被限制")
+    void testCalculateRecommended_cappedAtMax() {
+        DosingStrategy strategy = new DosingStrategy();
+        strategy.setId(2L);
+        strategy.setStrategyName("消毒投加");
+        strategy.setProcessStage("disinfection");
+        strategy.setChemicalName("次氯酸钠");
+        strategy.setEnabled(true);
+        strategy.setBaseDosingRate(new BigDecimal("10.0"));
+        strategy.setTurbidityThreshold(new BigDecimal("1.0"));
+        strategy.setMaxDosingRate(new BigDecimal("15.0"));
+        strategy.setMinDosingRate(new BigDecimal("2.0"));
+
+        when(strategyMapper.selectById(2L)).thenReturn(strategy);
+
+        // 浊度=100, 因子=100, 推荐=1000 → 被max限制为15
+        Map<String, Object> result = service.calculateRecommendedDosing(
+                2L, new BigDecimal("100.0"), null, null);
+
+        BigDecimal rate = (BigDecimal) result.get("recommendedRate");
+        assertEquals(0, rate.compareTo(new BigDecimal("15.0000")));
+    }
+
+    @Test
+    @DisplayName("测试策略推荐 - 策略不存在时返回错误")
+    void testCalculateRecommended_strategyNotFound() {
+        when(strategyMapper.selectById(999L)).thenReturn(null);
+
+        Map<String, Object> result = service.calculateRecommendedDosing(
+                999L, new BigDecimal("5.0"), null, null);
+
+        assertTrue(result.containsKey("error"));
+    }
+
+    @Test
+    @DisplayName("测试低库存预警列表")
+    void testLowStockAlerts() {
+        ChemicalStock lowStock = new ChemicalStock();
+        lowStock.setId(1L);
+        lowStock.setChemicalName("聚合氯化铝");
+        lowStock.setCurrentStock(new BigDecimal("30"));
+        lowStock.setMinStock(new BigDecimal("100"));
+        lowStock.setStatus("low");
+        lowStock.setStation("一水厂");
+
+        when(stockMapper.selectList(any(LambdaQueryWrapper.class))).thenReturn(List.of(lowStock));
+
+        List<Map<String, Object>> alerts = service.lowStockAlerts();
+
+        assertFalse(alerts.isEmpty());
+        Map<String, Object> alert = alerts.get(0);
+        assertEquals("聚合氯化铝", alert.get("chemicalName"));
+        assertEquals("low", alert.get("status"));
+        BigDecimal deficit = (BigDecimal) alert.get("deficit");
+        assertEquals(0, deficit.compareTo(new BigDecimal("70")));
+    }
+
+    @Test
+    @DisplayName("测试创建投加策略 - 默认启用")
+    void testCreateStrategy_defaultEnabled() {
+        DosingStrategy strategy = new DosingStrategy();
+        strategy.setStrategyName("测试策略");
+        strategy.setProcessStage("filtration");
+        strategy.setChemicalName("活性炭");
+
+        when(strategyMapper.insert(any())).thenReturn(1);
+
+        DosingStrategy result = service.createStrategy(strategy);
+
+        assertTrue(result.getEnabled());
+        assertNotNull(result.getCreatedTime());
+    }
+}