diff --git a/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/TCPClientHandler.java b/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/TCPClientHandler.java
index b1245f9c90..28fcca9e02 100644
--- a/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/TCPClientHandler.java
+++ b/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/TCPClientHandler.java
@@ -17,6 +17,7 @@
 
 package org.apache.eventmesh.runtime.admin.handler;
 
+import org.apache.eventmesh.common.Constants;
 import org.apache.eventmesh.common.protocol.tcp.UserAgent;
 import org.apache.eventmesh.common.utils.JsonUtils;
 import org.apache.eventmesh.runtime.admin.controller.HttpHandlerManager;
@@ -111,8 +112,8 @@ void delete(HttpExchange httpExchange) throws IOException {
 
             Error error = new Error(e.toString(), stackTrace);
             String result = JsonUtils.toJSONString(error);
-            httpExchange.sendResponseHeaders(500, result.getBytes().length);
-            out.write(result.getBytes());
+            httpExchange.sendResponseHeaders(500, result.getBytes(Constants.DEFAULT_CHARSET).length);
+            out.write(result.getBytes(Constants.DEFAULT_CHARSET));
         } finally {
             if (out != null) {
                 try {
@@ -163,8 +164,8 @@ void list(HttpExchange httpExchange) throws IOException {
             });
 
             String result = JsonUtils.toJSONString(getClientResponseList);
-            httpExchange.sendResponseHeaders(200, result.getBytes().length);
-            out.write(result.getBytes());
+            httpExchange.sendResponseHeaders(200, result.getBytes(Constants.DEFAULT_CHARSET).length);
+            out.write(result.getBytes(Constants.DEFAULT_CHARSET));
         } catch (Exception e) {
             StringWriter writer = new StringWriter();
             PrintWriter printWriter = new PrintWriter(writer);
@@ -174,8 +175,8 @@ void list(HttpExchange httpExchange) throws IOException {
 
             Error error = new Error(e.toString(), stackTrace);
             String result = JsonUtils.toJSONString(error);
-            httpExchange.sendResponseHeaders(500, result.getBytes().length);
-            out.write(result.getBytes());
+            httpExchange.sendResponseHeaders(500, result.getBytes(Constants.DEFAULT_CHARSET).length);
+            out.write(result.getBytes(Constants.DEFAULT_CHARSET));
         } finally {
             if (out != null) {
                 try {