diff --git a/src/main/java/com/qyft/ms/app/device/status/SprayTask.java b/src/main/java/com/qyft/ms/app/device/status/SprayTask.java
index 84f8ddb..e6a0d99 100644
--- a/src/main/java/com/qyft/ms/app/device/status/SprayTask.java
+++ b/src/main/java/com/qyft/ms/app/device/status/SprayTask.java
@@ -5,6 +5,7 @@ import com.qyft.ms.app.model.bo.SprayTaskSprayed;
 import com.qyft.ms.app.model.bo.SprayTaskStep;
 import lombok.Data;
 
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CopyOnWriteArrayList;
@@ -111,9 +112,13 @@ public class SprayTask {
     }
 
     public synchronized void addSprayTaskSprayed(SprayTaskSprayed task) {
-        if (sprayTaskSprayedList.size() >= 200) {
-            // 删除最旧的元素
-            sprayTaskSprayedList.remove(0);
+        LinkedHashSet<Integer> distinctNumbers = new LinkedHashSet<>();
+        for (SprayTaskSprayed item : sprayTaskSprayedList) {
+            distinctNumbers.add(item.getNumber());
+        }
+        if (!distinctNumbers.contains(task.getNumber()) && distinctNumbers.size() >= 4) {
+            Integer oldestNumber = distinctNumbers.iterator().next();
+            sprayTaskSprayedList.removeIf(item -> item.getNumber().equals(oldestNumber));
         }
         sprayTaskSprayedList.add(task);
     }
diff --git a/src/main/java/com/qyft/ms/app/model/bo/SprayTaskSprayed.java b/src/main/java/com/qyft/ms/app/model/bo/SprayTaskSprayed.java
index c66728f..5668ff9 100644
--- a/src/main/java/com/qyft/ms/app/model/bo/SprayTaskSprayed.java
+++ b/src/main/java/com/qyft/ms/app/model/bo/SprayTaskSprayed.java
@@ -3,8 +3,6 @@ package com.qyft.ms.app.model.bo;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
 
-import java.util.List;
-
 @Data
 @Schema(description = "喷涂任务已喷涂记录")
 public class SprayTaskSprayed {