diff --git a/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java b/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java
index ad7d1bb1..f7a97c41 100644
--- a/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java
+++ b/detection/src/main/java/com/njcn/gather/detection/service/impl/DetectionServiceImpl.java
@@ -1125,13 +1125,12 @@ public class DetectionServiceImpl {
 
     public List<Double> getDoubles(List<Double> t) {
         if (CollUtil.isNotEmpty(t)) {
-            if (t == null || t.size() < 2) {
-                return t;
+            if (t.size() > 2) {
+                Double max = Collections.max(t);
+                Double min = Collections.min(t);
+                t.remove(max);
+                t.remove(min);
             }
-            Double max = Collections.max(t);
-            Double min = Collections.min(t);
-            t.remove(max);
-            t.remove(min);
         }
         return t;
     }