diff --git a/backend/src/main/java/com/designhub/service/AnalyticsService.java b/backend/src/main/java/com/designhub/service/AnalyticsService.java
index 2fb04b4..68c10fc 100644
--- a/backend/src/main/java/com/designhub/service/AnalyticsService.java
+++ b/backend/src/main/java/com/designhub/service/AnalyticsService.java
@@ -668,7 +668,10 @@ public class AnalyticsService {
             BigDecimal deductionRate = getDeductionRate(designer.getDeptId(), currentMonth);
             
             for (Task task : designerTasks) {
-                if ("completed".equals(task.getStatus())) {
+                // 只计算在指定月份内完成的任务（与getDesignerDeductionDetails保持一致）
+                if ("completed".equals(task.getStatus()) && task.getActualEndTime() != null
+                    && !task.getActualEndTime().isBefore(startTime)
+                    && !task.getActualEndTime().isAfter(endTime)) {
                     // 计算任务积分
                     BigDecimal taskScore = BigDecimal.ZERO;
                     if (task.getScoreReward() != null && task.getScoreReward().compareTo(BigDecimal.ZERO) > 0) {