diff --git a/libsearch/file-utils.cpp b/libsearch/file-utils.cpp
index 21c5c83..8830f44 100644
--- a/libsearch/file-utils.cpp
+++ b/libsearch/file-utils.cpp
@@ -10,6 +10,8 @@
 #include <QMimeDatabase>
 #include <QMimeType>
 #include <QQueue>
+size_t FileUtils::_max_index_count = 0;
+size_t FileUtils::_current_index_count = 0;
 QMap<QString, QStringList> FileUtils::map_chinese2pinyin = QMap<QString, QStringList>();
 
 FileUtils::FileUtils()
diff --git a/libsearch/file-utils.h b/libsearch/file-utils.h
index 3e9271b..d9f707e 100644
--- a/libsearch/file-utils.h
+++ b/libsearch/file-utils.h
@@ -29,6 +29,8 @@ public:
     static QString getMimetype(QString &path, bool getsuffix = false);
     static QString *getDocxTextContent(QString &path);
     static QString *getTxtContent(QString &path);
+    static size_t _max_index_count;
+    static size_t _current_index_count;
 
 private:
     FileUtils();
diff --git a/libsearch/global-settings.cpp b/libsearch/global-settings.cpp
index 2511b3e..a0eee27 100644
--- a/libsearch/global-settings.cpp
+++ b/libsearch/global-settings.cpp
@@ -80,22 +80,28 @@ void GlobalSettings::resetAll()
     });
 }
 
-bool GlobalSettings::setBlockDirs(const QString &path, QString &returnMessage)
+bool GlobalSettings::setBlockDirs(const QString &path, QString &returnMessage, bool remove)
 {
+    //why QSetting's key can't start with "/"??
+    QString pathKey = path.right(path.length()-1);
+    if(remove)
+    {
+        m_block_dirs_settings->remove(pathKey);
+        return true;
+    }
     QStringList blockDirs = m_block_dirs_settings->allKeys();
     for(QString i:blockDirs)
     {
-//        qWarning()<<i;
-        if(path.right(path.length()-1).startsWith(i))
+        if(pathKey.startsWith(i))
         {
             returnMessage = QString(tr("Parent folder has been blocked!"));
             return false;
         }
 
-        if(i.startsWith(path.right(path.length()-1)))
+        if(i.startsWith(pathKey))
             m_block_dirs_settings->remove(i);
     }
-    m_block_dirs_settings->setValue(path.right(path.length()-1),"0");
+    m_block_dirs_settings->setValue(pathKey,"0");
     return true;
 }
 
diff --git a/libsearch/global-settings.h b/libsearch/global-settings.h
index 6685db2..a4d13d5 100644
--- a/libsearch/global-settings.h
+++ b/libsearch/global-settings.h
@@ -39,9 +39,10 @@ public Q_SLOTS:
      * set path for blacklist,return true if success,otherwise return false.
      * @param path path to be blocked
      * @param returnMessage this message will be set when return false.
+     * @param true to remove blocking,false to set blocking,default set false.
      * @return
      */
-    bool setBlockDirs(const QString& path, QString &returnMessage);
+    bool setBlockDirs(const QString& path, QString &returnMessage,bool remove = false);
     QStringList getBlockDirs();
 
     void forceSync(const QString& = nullptr);