diff --git a/inspect-main/inspect-main-task/src/main/java/com/inspect/analysis/service/impl/AnalysisServiceImpl.java b/inspect-main/inspect-main-task/src/main/java/com/inspect/analysis/service/impl/AnalysisServiceImpl.java
index ea21e14..70bfee8 100644
--- a/inspect-main/inspect-main-task/src/main/java/com/inspect/analysis/service/impl/AnalysisServiceImpl.java
+++ b/inspect-main/inspect-main-task/src/main/java/com/inspect/analysis/service/impl/AnalysisServiceImpl.java
@@ -742,7 +742,12 @@ public class AnalysisServiceImpl implements IAnalysisService {
     private AlgValue selectAlgMap(String devId, String type) {
         log.info("selectAlgMap patrolPointId: {}", devId);
         Map<String, String> thresholdMap = patrolResultService.selectPatrolPresetParam(devId);
-        log.info("selectAlgMap thresholdMap: {}", JSONObject.toJSONString(thresholdMap));
-        return new AlgValue(thresholdMap.get("alarm_max_temp"), thresholdMap.get("alarm_min_temp"));
+        if(thresholdMap != null) {
+            log.info("selectAlgMap thresholdMap: {}", JSONObject.toJSONString(thresholdMap));
+            return new AlgValue(thresholdMap.get("alarm_max_temp"), thresholdMap.get("alarm_min_temp"));
+        } else {
+            log.info("selectAlgMap thresholdMap is null");
+            return new AlgValue();
+        }
     }
 }