diff --git a/designer_base/src/com/fr/design/extra/PluginConstants.java b/designer_base/src/com/fr/design/extra/PluginConstants.java
deleted file mode 100644
index 4704ed129..000000000
--- a/designer_base/src/com/fr/design/extra/PluginConstants.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.fr.design.extra;
-
-/**
- * @author richie
- * @date 2015-03-11
- * @since 8.0
- */
-public class PluginConstants {
-
-
-    public static final int BYTES_NUM = 1024;
-
-
-
-}
\ No newline at end of file
diff --git a/designer_base/src/com/fr/design/extra/PluginHelper.java b/designer_base/src/com/fr/design/extra/PluginHelper.java
index ecaa34ea0..3248df0b4 100644
--- a/designer_base/src/com/fr/design/extra/PluginHelper.java
+++ b/designer_base/src/com/fr/design/extra/PluginHelper.java
@@ -7,6 +7,7 @@ import com.fr.design.extra.plugindependence.DownLoadDependenceUI;
 import com.fr.general.*;
 import com.fr.general.http.HttpClient;
 import com.fr.plugin.Plugin;
+import com.fr.stable.plugin.PluginConstants;
 import com.fr.plugin.PluginLoader;
 import com.fr.plugin.PluginManagerHelper;
 import com.fr.plugin.dependence.PluginDependence;
diff --git a/designer_base/src/com/fr/design/extra/plugindependence/DownLoadDependenceUI.java b/designer_base/src/com/fr/design/extra/plugindependence/DownLoadDependenceUI.java
index 958d8d160..8fa4f6c31 100644
--- a/designer_base/src/com/fr/design/extra/plugindependence/DownLoadDependenceUI.java
+++ b/designer_base/src/com/fr/design/extra/plugindependence/DownLoadDependenceUI.java
@@ -1,13 +1,13 @@
 package com.fr.design.extra.plugindependence;
 
 import com.fr.base.FRContext;
-import com.fr.design.extra.PluginConstants;
 import com.fr.design.extra.PluginHelper;
 import com.fr.design.mainframe.DesignerContext;
 import com.fr.general.IOUtils;
 import com.fr.general.Inter;
 import com.fr.general.SiteCenter;
 import com.fr.general.http.HttpClient;
+import com.fr.stable.plugin.PluginConstants;
 import com.fr.plugin.dependence.PluginDependenceException;
 import com.fr.plugin.dependence.PluginDependenceUnit;
 import com.fr.stable.StableUtils;