diff --git a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/BackendUtil.java b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/BackendUtil.java
index 64ddc6400..cb5b6f2ae 100644
--- a/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/BackendUtil.java
+++ b/flink-doris-connector/src/main/java/org/apache/doris/flink/sink/BackendUtil.java
@@ -89,7 +89,9 @@ public String getAvailableBackend() {
 
     public static boolean tryHttpConnection(String host) {
         try {
-            LOG.debug("try to connect host {}", host);
+            if (LOG.isDebugEnabled()) {
+                LOG.debug("try to connect host {}", host);
+            }
             host = "http://" + host;
             URL url = new URL(host);
             HttpURLConnection co = (HttpURLConnection) url.openConnection();