diff --git a/projects/sample/source/sample-constant/src/main/java/com/tencent/shadow/sample/constant/Constant.java b/projects/sample/source/sample-constant/src/main/java/com/tencent/shadow/sample/constant/Constant.java
index 8e340939f..198666098 100644
--- a/projects/sample/source/sample-constant/src/main/java/com/tencent/shadow/sample/constant/Constant.java
+++ b/projects/sample/source/sample-constant/src/main/java/com/tencent/shadow/sample/constant/Constant.java
@@ -28,4 +28,5 @@ final public class Constant {
 
     public static final int FROM_ID_NOOP = 1000;
     public static final int FROM_ID_START_ACTIVITY = 1002;
+    public static final int FROM_ID_CLOSE = 1003;
 }
diff --git a/projects/sample/source/sample-host/src/main/java/com/tencent/shadow/sample/host/PluginLoadActivity.java b/projects/sample/source/sample-host/src/main/java/com/tencent/shadow/sample/host/PluginLoadActivity.java
index 56c7297ed..091cd0b61 100644
--- a/projects/sample/source/sample-host/src/main/java/com/tencent/shadow/sample/host/PluginLoadActivity.java
+++ b/projects/sample/source/sample-host/src/main/java/com/tencent/shadow/sample/host/PluginLoadActivity.java
@@ -87,6 +87,7 @@ public void onEnterComplete() {
     @Override
     protected void onDestroy() {
         super.onDestroy();
+        HostApplication.getApp().getPluginManager().enter(this, Constant.FROM_ID_CLOSE, null, null);
         mViewGroup.removeAllViews();
     }
 }
diff --git a/projects/sample/source/sample-manager/src/main/java/com/tencent/shadow/sample/manager/SamplePluginManager.java b/projects/sample/source/sample-manager/src/main/java/com/tencent/shadow/sample/manager/SamplePluginManager.java
index 929f06454..32284d229 100644
--- a/projects/sample/source/sample-manager/src/main/java/com/tencent/shadow/sample/manager/SamplePluginManager.java
+++ b/projects/sample/source/sample-manager/src/main/java/com/tencent/shadow/sample/manager/SamplePluginManager.java
@@ -80,6 +80,8 @@ public void enter(final Context context, long fromId, Bundle bundle, final Enter
             //do nothing.
         } else if (fromId == Constant.FROM_ID_START_ACTIVITY) {
             onStartActivity(context, bundle, callback);
+        } else if (fromId == Constant.FROM_ID_CLOSE) {
+            close();
         } else {
             throw new IllegalArgumentException("不认识的fromId==" + fromId);
         }
diff --git a/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/BasePluginManager.java b/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/BasePluginManager.java
index f07b3759c..eafadd9f6 100644
--- a/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/BasePluginManager.java
+++ b/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/BasePluginManager.java
@@ -57,7 +57,7 @@ public abstract class BasePluginManager {
     /**
      * 插件信息查询数据库接口
      */
-    private InstalledDao mInstalledDao;
+    final private InstalledDao mInstalledDao;
 
     /**
      * UI线程的handler
@@ -296,4 +296,11 @@ private boolean deletePart(InstalledPlugin.Part part) {
     public String getAbi() {
         return null;
     }
+
+    /**
+     * 释放资源
+     */
+    public void close() {
+        mInstalledDao.close();
+    }
 }
diff --git a/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/installplugin/InstalledDao.java b/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/installplugin/InstalledDao.java
index ef4f7bbdc..65a5ff6b0 100644
--- a/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/installplugin/InstalledDao.java
+++ b/projects/sdk/core/manager/src/main/java/com/tencent/shadow/core/manager/installplugin/InstalledDao.java
@@ -34,7 +34,7 @@
 
 public class InstalledDao {
 
-    private InstalledPluginDBHelper mDBHelper;
+    final private InstalledPluginDBHelper mDBHelper;
 
     public InstalledDao(InstalledPluginDBHelper dbHelper) {
         mDBHelper = dbHelper;
@@ -171,7 +171,6 @@ public List<InstalledPlugin> getLastPlugins(int limit) {
         for (String uuid : uuids) {
             installedPlugins.add(getInstalledPluginByUUID(uuid));
         }
-        db.close();
         return installedPlugins;
     }
 
@@ -218,4 +217,10 @@ private List<ContentValues> parseConfig(PluginConfig pluginConfig, String soDir,
     }
 
 
+    /**
+     * 释放资源
+     */
+    public void close() {
+        mDBHelper.close();
+    }
 }