diff --git a/libsearch/file-utils.cpp b/libsearch/file-utils.cpp
index 89ccb03..681f311 100644
--- a/libsearch/file-utils.cpp
+++ b/libsearch/file-utils.cpp
@@ -185,10 +185,9 @@ QString FileUtils::getSettingName(const QString &setting) {
 
 bool FileUtils::isOrUnder(QString pathA, QString pathB)
 {
-    if(pathA[0] != "/")
-        pathA.prepend("/");
-    if(pathB[0] != "/")
-        pathB.prepend("/");
+    if (pathB == "/") {
+        return true;
+    }
 
     if(pathA.length() < pathB.length())
         return false;
diff --git a/libsearch/global-settings.cpp b/libsearch/global-settings.cpp
index 44cb0ff..38e4955 100644
--- a/libsearch/global-settings.cpp
+++ b/libsearch/global-settings.cpp
@@ -37,7 +37,11 @@ GlobalSettings::GlobalSettings(QObject *parent) : QObject(parent)
     //搜索黑名单过滤
     m_blockDirsSettings = new QSettings(BLOCK_DIRS, QSettings::IniFormat, this);
     m_blockDirsSettings->setIniCodec(QTextCodec::codecForName("UTF-8"));
-    m_blockDirsSettings->setValue("These_are_block_dirs_conf_for_ukui_search","0");
+    if (!QFile::exists(BLOCK_DIRS)) {
+        QFile file(BLOCK_DIRS);
+        file.open(QIODevice::ReadOnly);
+        file.close();
+    }
     m_blockDirsSettings->sync();
 
     m_confWatcher = new QFileSystemWatcher(this);
@@ -177,7 +181,18 @@ bool GlobalSettings::setBlockDirs(const QString &path, int &returnCode, bool rem
 }
 
 QStringList GlobalSettings::getBlockDirs() {
-    return m_blockDirsSettings->allKeys();
+    QStringList blockList;
+    QStringList tmp = m_blockDirsSettings->allKeys();
+    for (const QString& blockDir : tmp) {
+        QString wholePath = "/" + blockDir;
+        if (QFile::exists(wholePath)) {
+            blockList.append(wholePath);
+        } else {
+            m_blockDirsSettings->remove(blockDir);
+            m_blockDirsSettings->sync();
+        }
+    }
+    return blockList;
 }
 
 void GlobalSettings::setSearchRecord(const QString &word, const QDateTime &time) {
diff --git a/libsearch/index/search-manager.cpp b/libsearch/index/search-manager.cpp
index e6aa032..1623145 100644
--- a/libsearch/index/search-manager.cpp
+++ b/libsearch/index/search-manager.cpp
@@ -497,11 +497,17 @@ void DirectSearch::run() {
     QStringList searchPath = DirWatcher::getDirWatcher()->currentIndexableDir();
     QQueue<QString> bfs;
     for (const QString &path : searchPath) {
-        if (blockList.contains(path)) {
-            continue;
+        bool underBlock(false);
+        for (const QString &blockDir : blockList) {
+            if (FileUtils::isOrUnder(path, blockDir)) {
+                underBlock = true;
+                break;
+            }
+        }
+        if (!underBlock) {
+            blockList.append(DirWatcher::getDirWatcher()->blackListOfDir(path));
+            bfs.enqueue(path);
         }
-        blockList.append(DirWatcher::getDirWatcher()->blackListOfDir(path));
-        bfs.enqueue(path);
     }
     if (bfs.isEmpty()) {
         return;
diff --git a/search-ukcc-plugin/search.cpp b/search-ukcc-plugin/search.cpp
index 352415d..cdc9a55 100644
--- a/search-ukcc-plugin/search.cpp
+++ b/search-ukcc-plugin/search.cpp
@@ -520,8 +520,18 @@ void Search::initFileDialog()
 void Search::getBlockDirs()
 {
     m_blockDirs.clear();
-    if (m_dirSettings)
-        m_blockDirs = m_dirSettings->allKeys();
+    if (m_dirSettings) {
+        QStringList blockList = m_dirSettings->allKeys();
+        for (const QString &blockDir : blockList) {
+            QString wholePath = "/" + blockDir;
+            if (QFile::exists(wholePath)) {
+                m_blockDirs << wholePath;
+            } else {
+                m_dirSettings->remove(blockDir);
+                m_dirSettings->sync();
+            }
+        }
+    }
 }
 
 /**
@@ -538,31 +548,37 @@ int Search::setBlockDir(const QString &dirPath, const bool &is_add)
         }
         //删除黑名单目录
         m_dirSettings->remove(dirPath);
+        m_dirSettings->sync();
         removeBlockDirFromList(dirPath);
         return ReturnCode::Succeed;
     }
-//    if (!dirPath.startsWith(QDir::homePath())) {
-//        return ReturnCode::NotInHomeDir;
-//    }
 
-    QString pathKey = dirPath.right(dirPath.length() - 1);
+    QStringList oldBlockList = m_blockDirs;
+    getBlockDirs();
+    for (const QString& oldBlockDir : oldBlockList) {
+        if (!m_blockDirs.contains(oldBlockDir)) {
+            removeBlockDirFromList(oldBlockDir);
+        }
+    }
+
 
     for (QString dir : m_blockDirs) {
-        if (pathKey == dir) {
+        if (dirPath == dir) {
             return ReturnCode::HasBeenBlocked;
         }
 
-        if (pathKey.startsWith(dir)) {
+        if (dirPath.startsWith(dir + "/") || dir == "/") {
             return ReturnCode::ParentExist;
         }
 
         //有它的子文件夹已被添加，删除这些子文件夹
-        if (dir.startsWith(pathKey)) {
+        if (dir.startsWith(dirPath + "/") || dirPath == "/") {
             m_dirSettings->remove(dir);
-            removeBlockDirFromList("/" + dir);
+            removeBlockDirFromList(dir);
         }
     }
-    m_dirSettings->setValue(pathKey, "0");
+    m_dirSettings->setValue(dirPath.right(dirPath.length() - 1), "0");
+    m_dirSettings->sync();
     appendBlockDirToList(dirPath);
     return ReturnCode::Succeed;
 }
@@ -574,9 +590,8 @@ void Search::initBlockDirsList()
 {
     getBlockDirs();
     for (QString path: m_blockDirs) {
-        QString wholePath = QString("/%1").arg(path);
-        if (QFileInfo(wholePath).isDir() /*&& path.startsWith("home")*/) {
-            appendBlockDirToList(wholePath);
+        if (QFileInfo(path).isDir() /*&& path.startsWith("home")*/) {
+            appendBlockDirToList(path);
         }
     }
 }