diff --git a/README.md b/README.md
index ad3f0771ecfe39aab67d6f1ab393b5277f16eec2..e8730ef37fe44d0a60a315944c9591bea8c6b423 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@
     ......
  }
 ```
-在sdk6，DevEco Studio2.2 beta1下项目可直接运行 如无法运行，
+在sdk6，DevEco Studio 2.2 beta1下项目可直接运行 如无法运行，
 删除项目.gradle,.idea,build,gradle,build.gradle文件， 
 并依据自己的版本创建新项目，将新项目的对应文件复制到根目录下
 
diff --git a/entry/src/main/java/com/developer/filepicker/file/slice/MainAbilitySlice.java b/entry/src/main/java/com/developer/filepicker/file/slice/MainAbilitySlice.java
index be93a8ab91e0b61ec0dc8463aa9be72eab435fef..961f26b9bfebc5b7ee29bcbcaab2c2775f425bff 100644
--- a/entry/src/main/java/com/developer/filepicker/file/slice/MainAbilitySlice.java
+++ b/entry/src/main/java/com/developer/filepicker/file/slice/MainAbilitySlice.java
@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.developer.filepicker.file.slice;
 
 import com.developer.filepicker.file.FileListAdapter;
@@ -30,6 +45,11 @@ import java.io.IOException;
 import java.io.OutputStream;
 import java.util.ArrayList;
 
+/** MainAbilitySlice
+ *
+ * @author ljx
+ * @since 2021-07-012
+ */
 public class MainAbilitySlice extends AbilitySlice {
     private static final int CAPACITY = 1024;
     private static final int CONSTANT = -1;
diff --git a/library/src/main/java/com/developer/filepicker/model/DialogConfigs.java b/library/src/main/java/com/developer/filepicker/model/DialogConfigs.java
index 7837efe13af3521367356b349edddf718c876725..5f9f28664607969bb56f6b1114c088f632f2feb9 100644
--- a/library/src/main/java/com/developer/filepicker/model/DialogConfigs.java
+++ b/library/src/main/java/com/developer/filepicker/model/DialogConfigs.java
@@ -29,20 +29,4 @@ public abstract class DialogConfigs {
      * file_and_dir_select
      */
     public static final int FILE_AND_DIR_SELECT = 2;
-
-    /**
-     * parent_directory
-     */
-    private static final String DIRECTORY_SEPARATOR = "/";
-
-    /**
-     * storage_dir
-     */
-    private static final String STORAGE_DIR = "/storage/emulated/0/Android/data/com.developer.filepicker.file";
-
-    /**
-     * DEFAULT_DIR is the default mount point of the SDCARD.
-     * It is the default mount point.
-     */
-    public static final String DEFAULT_DIR = DIRECTORY_SEPARATOR + STORAGE_DIR;
 }
\ No newline at end of file