diff --git a/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqRMapper.java b/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqRMapper.java
index 12f6f401..aa9cb6b2 100644
--- a/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqRMapper.java
+++ b/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqRMapper.java
@@ -25,4 +25,18 @@ public interface SdWqRMapper extends BaseMapper<SdWqR> {
                                             @Param("fieldName") String fieldName,
                                             @Param("startTime") String startTime,
                                             @Param("endTime") String endTime);
+
+    /**
+     * 查询水质达标数据（小时级），按 STCD 聚合 SFDB=1 达标数、SFDB IN (0,1) 总数
+     */
+    List<Map<String, Object>> selectComplianceData(@Param("stcdList") List<String> stcdList,
+                                                   @Param("startTime") String startTime,
+                                                   @Param("endTime") String endTime);
+
+    /**
+     * 查询各测站不达标要素（SFDB=0 时的 WQ_SFDBHN_YS）
+     */
+    List<Map<String, Object>> selectPollutants(@Param("stcdList") List<String> stcdList,
+                                               @Param("startTime") String startTime,
+                                               @Param("endTime") String endTime);
 }
diff --git a/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqdaySMapper.java b/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqdaySMapper.java
index 2a2dd55e..ea974884 100644
--- a/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqdaySMapper.java
+++ b/backend/src/main/java/com/yfd/platform/qgc_export/mapper/SdWqdaySMapper.java
@@ -25,4 +25,11 @@ public interface SdWqdaySMapper extends BaseMapper<SdWqdayS> {
                                             @Param("fieldName") String fieldName,
                                             @Param("startTime") String startTime,
                                             @Param("endTime") String endTime);
+
+    /**
+     * 查询水质达标数据（日级），按 STCD 聚合 SFDB=1 达标数、SFDB IN (0,1) 总数
+     */
+    List<Map<String, Object>> selectComplianceData(@Param("stcdList") List<String> stcdList,
+                                                   @Param("startTime") String startTime,
+                                                   @Param("endTime") String endTime);
 }
diff --git a/backend/src/main/java/com/yfd/platform/qgc_export/service/impl/QgcExportServiceImpl.java b/backend/src/main/java/com/yfd/platform/qgc_export/service/impl/QgcExportServiceImpl.java
index bb1a2e9f..bffd473d 100644
--- a/backend/src/main/java/com/yfd/platform/qgc_export/service/impl/QgcExportServiceImpl.java
+++ b/backend/src/main/java/com/yfd/platform/qgc_export/service/impl/QgcExportServiceImpl.java
@@ -180,6 +180,8 @@ public class QgcExportServiceImpl implements IQgcExportService {
             if (mr == null) continue;
 
             List<ExportZipUtil.SheetData> sheets = new ArrayList<>();
+            // 判断是否包含水质指标，后续用于追加 WQ 合规 Sheet
+            boolean hasWqIndicator = false;
             for (ExportIndicatorProcessor processor : processors) {
                 List<List<Object>> rows;
                 // QEC 自定义三栏达标率格式
@@ -223,6 +225,33 @@ public class QgcExportServiceImpl implements IQgcExportService {
                         ));
                     }
                     sheets.add(sd);
+                    if ("WQ".equals(sttp)) {
+                        hasWqIndicator = true;
+                    }
+                }
+            }
+
+            // 若包含水质指标，追加 WQ 合规 Sheet
+            if (hasWqIndicator) {
+                List<List<Object>> complianceRows = buildWqComplianceSheet(mr, stationOrder, stationRes);
+                if (complianceRows != null) {
+                    List<String> complianceHeaders = new ArrayList<>();
+                    complianceHeaders.add("水质站");
+                    complianceHeaders.add("小时");
+                    complianceHeaders.add("");
+                    complianceHeaders.add("");
+                    complianceHeaders.add("日均");
+                    complianceHeaders.add("");
+                    complianceHeaders.add("");
+                    complianceHeaders.add("主要污染物");
+                    ExportZipUtil.SheetData sd = new ExportZipUtil.SheetData("水质达标率", complianceHeaders, complianceRows);
+                    sd.setHeaderRowCount(1);
+                    sd.setMergedRegions(Arrays.asList(
+                            new int[]{0, 1, 0, 0},   // "水质站" 合并 row 0-1
+                            new int[]{0, 0, 1, 3},   // "小时" 合并 col 1-3
+                            new int[]{0, 0, 4, 6}    // "日均" 合并 col 4-6
+                    ));
+                    sheets.add(sd);
                 }
             }
 
@@ -449,6 +478,126 @@ public class QgcExportServiceImpl implements IQgcExportService {
         try { return Integer.parseInt(v.toString()); } catch (Exception e) { return -1; }
     }
 
+    // ======================== WQ 水质达标率 Sheet（双表头） ========================
+
+    /**
+     * 构建水质达标率 Sheet 的数据行（不含标题行，标题由调用方放入 headers）。
+     * <p>
+     * 返回的 rows[0] 是子标题行（|达标数|总数|达标率(%)|达标数|总数|达标率(%)|），后续为电站数据行。
+     */
+    private List<List<Object>> buildWqComplianceSheet(
+            MonthRange mr, List<String> stationOrder, StationResolution stationRes) {
+
+        String sttp = "WQ";
+        Map<String, String> rstcdToStcd = new LinkedHashMap<>();
+        for (String rstcd : stationOrder) {
+            String stcd = stationRes.getStcd(rstcd, sttp);
+            if (stcd != null) {
+                rstcdToStcd.put(rstcd, stcd);
+            }
+        }
+        if (rstcdToStcd.isEmpty()) {
+            log.warn("水质达标率未找到 STTP=WQ 的测站数据");
+            return null;
+        }
+
+        List<String> uniqueStcds = rstcdToStcd.values().stream().distinct().toList();
+        String startStr = SDF.format(mr.getStart());
+        String endStr = SDF.format(mr.getEnd());
+
+        // 查询小时达标数据
+        List<Map<String, Object>> hourlyData = sdWqRMapper.selectComplianceData(uniqueStcds, startStr, endStr);
+        // 查询日均达标数据
+        List<Map<String, Object>> dailyData = sdWqdaySMapper.selectComplianceData(uniqueStcds, startStr, endStr);
+        // 查询主要污染物
+        List<Map<String, Object>> pollutantData = sdWqRMapper.selectPollutants(uniqueStcds, startStr, endStr);
+
+        // 按 STCD 索引达标统计
+        Map<String, Map<String, Object>> hourlyMap = new LinkedHashMap<>();
+        for (Map<String, Object> m : hourlyData) {
+            hourlyMap.put((String) m.get("STCD"), m);
+        }
+        Map<String, Map<String, Object>> dailyMap = new LinkedHashMap<>();
+        for (Map<String, Object> m : dailyData) {
+            dailyMap.put((String) m.get("STCD"), m);
+        }
+        // 按 STCD 聚合污染物（去重后用逗号分隔）
+        Map<String, Set<String>> pollutantSetMap = new LinkedHashMap<>();
+        for (Map<String, Object> m : pollutantData) {
+            String stcd = (String) m.get("STCD");
+            String pol = (String) m.get("POLLUTANT");
+            if (pol != null && !pol.isEmpty()) {
+                pollutantSetMap.computeIfAbsent(stcd, k -> new LinkedHashSet<>()).add(pol);
+            }
+        }
+
+        // ======== Row 0: 子标题行 ========
+        List<Object> subRow = new ArrayList<>();
+        subRow.add("");
+        subRow.add("达标数");
+        subRow.add("总数");
+        subRow.add("达标率(%)");
+        subRow.add("达标数");
+        subRow.add("总数");
+        subRow.add("达标率(%)");
+        subRow.add("");
+
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(subRow);
+
+        // ======== 数据行 ========
+        for (String rstcd : stationOrder) {
+            String stcd = rstcdToStcd.get(rstcd);
+            if (stcd == null) continue;
+
+            String displayName = stationRes.getDisplayName(rstcd, sttp);
+            Map<String, Object> hStat = hourlyMap.get(stcd);
+            Map<String, Object> dStat = dailyMap.get(stcd);
+
+            List<Object> row = new ArrayList<>();
+            row.add(displayName != null ? displayName : rstcd);
+
+            // 小时达标
+            appendComplianceCell(row, hStat);
+            // 日均达标
+            appendComplianceCell(row, dStat);
+
+            // 主要污染物
+            Set<String> pollutants = pollutantSetMap.get(stcd);
+            row.add(pollutants != null && !pollutants.isEmpty()
+                    ? String.join(",", pollutants) : "");
+
+            rows.add(row);
+        }
+
+        return rows;
+    }
+
+    /**
+     * 将达标统计 Map 的达标数/总数/达标率追加到 row
+     */
+    private void appendComplianceCell(List<Object> row, Map<String, Object> stat) {
+        if (stat == null) {
+            row.add("");
+            row.add("");
+            row.add("");
+            return;
+        }
+        Object compliantObj = stat.get("COMPLIANT_CNT");
+        Object totalObj = stat.get("TOTAL_CNT");
+        long compliant = compliantObj instanceof Number ? ((Number) compliantObj).longValue() : 0;
+        long total = totalObj instanceof Number ? ((Number) totalObj).longValue() : 0;
+
+        row.add(compliant);
+        row.add(total);
+        if (total > 0) {
+            BigDecimal rate = BigDecimal.valueOf(compliant * 100.0 / total);
+            row.add(rate.setScale(2, RoundingMode.HALF_UP).toPlainString());
+        } else {
+            row.add("");
+        }
+    }
+
     /** 分部达标统计 */
     private static class ComplianceStats {
         String dailyHb, dailySl, dailyDn;
diff --git a/backend/src/main/resources/mapper/qgc_export/SdWqRMapper.xml b/backend/src/main/resources/mapper/qgc_export/SdWqRMapper.xml
index 3026c9fb..987b757e 100644
--- a/backend/src/main/resources/mapper/qgc_export/SdWqRMapper.xml
+++ b/backend/src/main/resources/mapper/qgc_export/SdWqRMapper.xml
@@ -24,4 +24,39 @@
         AND ${fieldName} IS NOT NULL
     </select>
 
+    <!-- 水质小时达标率统计：按 STCD 聚合 SFDB=1 达标数、总数 -->
+    <select id="selectComplianceData" resultType="java.util.HashMap">
+        SELECT
+            STCD,
+            SUM(CASE WHEN SFDB = 1 THEN 1 ELSE 0 END) AS COMPLIANT_CNT,
+            SUM(CASE WHEN SFDB IN (0, 1) THEN 1 ELSE 0 END) AS TOTAL_CNT
+        FROM SD_WQ_R
+        WHERE IS_DELETED = 0
+        AND STCD IN
+        <foreach collection="stcdList" item="stcd" open="(" separator="," close=")">
+            #{stcd}
+        </foreach>
+        AND TM &gt;= TO_DATE(#{startTime}, 'YYYY-MM-DD HH24:MI:SS')
+        AND TM &lt; TO_DATE(#{endTime}, 'YYYY-MM-DD HH24:MI:SS')
+        AND SFDB IS NOT NULL
+        GROUP BY STCD
+    </select>
+
+    <!-- 查询各测站主要污染物（SFDB=0 时的 WQ_SFDBHN_YS） -->
+    <select id="selectPollutants" resultType="java.util.HashMap">
+        SELECT
+            STCD,
+            WQ_SFDBHN_YS AS POLLUTANT
+        FROM SD_WQ_R
+        WHERE IS_DELETED = 0
+        AND SFDB = 0
+        AND WQ_SFDBHN_YS IS NOT NULL
+        AND STCD IN
+        <foreach collection="stcdList" item="stcd" open="(" separator="," close=")">
+            #{stcd}
+        </foreach>
+        AND TM &gt;= TO_DATE(#{startTime}, 'YYYY-MM-DD HH24:MI:SS')
+        AND TM &lt; TO_DATE(#{endTime}, 'YYYY-MM-DD HH24:MI:SS')
+    </select>
+
 </mapper>
diff --git a/backend/src/main/resources/mapper/qgc_export/SdWqdaySMapper.xml b/backend/src/main/resources/mapper/qgc_export/SdWqdaySMapper.xml
index 4541f84e..3fbd4aa9 100644
--- a/backend/src/main/resources/mapper/qgc_export/SdWqdaySMapper.xml
+++ b/backend/src/main/resources/mapper/qgc_export/SdWqdaySMapper.xml
@@ -23,4 +23,22 @@
         AND ${fieldName} IS NOT NULL
     </select>
 
+    <!-- 水质日均达标率统计：按 STCD 聚合 SFDB=1 达标数、总数 -->
+    <select id="selectComplianceData" resultType="java.util.HashMap">
+        SELECT
+            STCD,
+            SUM(CASE WHEN SFDB = 1 THEN 1 ELSE 0 END) AS COMPLIANT_CNT,
+            SUM(CASE WHEN SFDB IN (0, 1) THEN 1 ELSE 0 END) AS TOTAL_CNT
+        FROM SD_WQDAY_S
+        WHERE IS_DELETED = 0
+        AND STCD IN
+        <foreach collection="stcdList" item="stcd" open="(" separator="," close=")">
+            #{stcd}
+        </foreach>
+        AND DT &gt;= TO_DATE(#{startTime}, 'YYYY-MM-DD HH24:MI:SS')
+        AND DT &lt; TO_DATE(#{endTime}, 'YYYY-MM-DD HH24:MI:SS')
+        AND SFDB IS NOT NULL
+        GROUP BY STCD
+    </select>
+
 </mapper>