diff --git a/designer-base/src/main/java/com/fr/design/utils/DesignUtils.java b/designer-base/src/main/java/com/fr/design/utils/DesignUtils.java
index 752aa653f1..b91ca4d8e1 100644
--- a/designer-base/src/main/java/com/fr/design/utils/DesignUtils.java
+++ b/designer-base/src/main/java/com/fr/design/utils/DesignUtils.java
@@ -69,7 +69,9 @@ public class DesignUtils {
 
     private static Integer port;
 
+    private static final String TURE = "true";
 
+    private static final String DEBUG = "debug";
     private static boolean started = false;
 
 
@@ -82,7 +84,7 @@ public class DesignUtils {
 
     public synchronized static int getPort() {
         if (port == null) {
-            if (ComparatorUtils.equals("true", System.getProperty("debug"))) {
+            if (ComparatorUtils.equals(TURE, System.getProperty(DEBUG))) {
                 setPort(DesignerPort.getInstance().getDebugMessagePort());
             } else {
                 setPort(DesignerPort.getInstance().getMessagePort());