diff --git a/zh-module-applet/zh-applet-api/src/main/java/org/jeecg/system/applet/controller/SurvAlertRecordController.java b/zh-module-applet/zh-applet-api/src/main/java/org/jeecg/system/applet/controller/SurvAlertRecordController.java
index 2d8b541..53b2e78 100644
--- a/zh-module-applet/zh-applet-api/src/main/java/org/jeecg/system/applet/controller/SurvAlertRecordController.java
+++ b/zh-module-applet/zh-applet-api/src/main/java/org/jeecg/system/applet/controller/SurvAlertRecordController.java
@@ -5,6 +5,7 @@ import io.swagger.annotations.ApiOperation;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
 import org.jeecg.common.dto.SurvSummaryDTO;
+import org.jeecg.common.util.DateParseUtils;
 import org.jeecg.common.util.R;
 import org.jeecg.common.vo.statistic.AlertSummaryVo;
 import org.jeecg.common.vo.statistic.SurvSummaryVo;
@@ -19,6 +20,8 @@ import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.time.LocalDateTime;
+
 
 /**
  * @Description: surv_alert_record
@@ -48,9 +51,10 @@ public class SurvAlertRecordController {
         String tenantId =  TenantUtil.getCurTenant(null);
         survSummaryDTO.setTenantId(tenantId);
         if(StringUtils.isNotBlank(survSummaryDTO.getStartTime())){
-            if(survSummaryDTO.getStartTime().equals(survSummaryDTO.getEndTime())){//开始时间与结束时间相同，则清空，避免查询到空数据
-                survSummaryDTO.setStartTime("");
-                survSummaryDTO.setEndTime("");
+            if(survSummaryDTO.getStartTime().equals(survSummaryDTO.getEndTime())){
+                LocalDateTime startTime =  DateParseUtils.parseToLocalDateTime(survSummaryDTO.getStartTime());
+                startTime=startTime.minusDays(30);
+                survSummaryDTO.setStartTime(DateParseUtils.formatLocalDateTime(startTime,"yyyy-MM-dd"));//开始时间改为结束时间的30天前
             }
         }
         SurvSummaryVo survSummaryVo = zhAdminFeignClient.stationDeviceSummary(survSummaryDTO);