diff --git a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java
index fbee0c54f..1075b2789 100644
--- a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java
+++ b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/PersistenceThread.java
@@ -21,7 +21,6 @@ public class PersistenceThread extends Thread {
         File file1;
         BufferedReader bufferedReader;
         int offset;
-        StringBuffer data;
         while (true) {
             file1 = getDataFiles();
             if (file1 == null) {