diff --git a/src/main/java/com/seeyon/apps/src_leasebill/util/LeaseBillUtil.java b/src/main/java/com/seeyon/apps/src_leasebill/util/LeaseBillUtil.java
index d277584..a8e0b6b 100644
--- a/src/main/java/com/seeyon/apps/src_leasebill/util/LeaseBillUtil.java
+++ b/src/main/java/com/seeyon/apps/src_leasebill/util/LeaseBillUtil.java
@@ -226,10 +226,17 @@ public class LeaseBillUtil {
             Map<String, String> bill = new HashMap<>();
             bill.put(fieldDisplayNameService.getDisplayName("开始日期"), getSdf().format(tempStart.getTime()));
 
-            // 计算本期结束日 = 开始时间 + 周期月数 - 1天
+            // 计算本期结束日
             Calendar periodEnd = (Calendar) tempStart.clone();
             periodEnd.add(Calendar.MONTH, payCycleMonths);
-            periodEnd.add(Calendar.DATE, -1);
+            // 月末日期特殊处理：起始日为月末时，周期结束日也保持为目标月月末
+            int startDay = tempStart.get(Calendar.DAY_OF_MONTH);
+            int startMaxDay = tempStart.getActualMaximum(Calendar.DAY_OF_MONTH);
+            if (startDay == startMaxDay) {
+                periodEnd.set(Calendar.DATE, periodEnd.getActualMaximum(Calendar.DATE));
+            } else {
+                periodEnd.add(Calendar.DATE, -1);
+            }
 
             if (periodEnd.before(endTime)) {
                 // 正常完整周期