diff --git a/server/src/main/java/org/apache/iotdb/db/sink/alertmanager/AlertManagerHandler.java b/server/src/main/java/org/apache/iotdb/db/sink/alertmanager/AlertManagerHandler.java
index fd6076ff15210..600bb72db015f 100644
--- a/server/src/main/java/org/apache/iotdb/db/sink/alertmanager/AlertManagerHandler.java
+++ b/server/src/main/java/org/apache/iotdb/db/sink/alertmanager/AlertManagerHandler.java
@@ -61,9 +61,11 @@ public void close() throws IOException {
 
   @Override
   public void open(org.apache.iotdb.db.sink.alertmanager.AlertManagerConfiguration configuration) {
-    this.request = new HttpPost(configuration.getEndpoint());
-    request.setHeader("Accept", "application/json");
-    request.setHeader("Content-type", "application/json");
+    if (this.request == null) {
+      this.request = new HttpPost(configuration.getEndpoint());
+      request.setHeader("Accept", "application/json");
+      request.setHeader("Content-type", "application/json");
+    }
 
     openClient();
   }