diff --git a/src/dfm-base/mimetype/mimetypedisplaymanager.h b/src/dfm-base/mimetype/mimetypedisplaymanager.h
index a0d1c0e04a..3b8323158b 100644
--- a/src/dfm-base/mimetype/mimetypedisplaymanager.h
+++ b/src/dfm-base/mimetype/mimetypedisplaymanager.h
@@ -23,7 +23,6 @@ class MimeTypeDisplayManager : public QObject
     FileInfo::FileType displayNameToEnum(const QString &mimeType);
     QString defaultIcon(const QString &mimeType);
     QMap<FileInfo::FileType, QString> displayNames();
-    void loadSupportMimeTypes();
     QStringList supportArchiveMimetypes();
     QStringList supportVideoMimeTypes();
     QStringList supportAudioMimeTypes();
@@ -31,6 +30,7 @@ class MimeTypeDisplayManager : public QObject
 private:
     explicit MimeTypeDisplayManager(QObject *parent = nullptr);
     void initData();
+    void loadSupportMimeTypes();
     QStringList readlines(const QString &path);
 
 private:
diff --git a/src/dfm-base/utils/thumbnail/thumbnailhelper.cpp b/src/dfm-base/utils/thumbnail/thumbnailhelper.cpp
index 1585313332..50dba28867 100644
--- a/src/dfm-base/utils/thumbnail/thumbnailhelper.cpp
+++ b/src/dfm-base/utils/thumbnail/thumbnailhelper.cpp
@@ -30,6 +30,7 @@ DFMGLOBAL_USE_NAMESPACE
 
 ThumbnailHelper::ThumbnailHelper()
 {
+    QObject::connect(this, &ThumbnailHelper::saveImage, this, &ThumbnailHelper::onSaveImage, Qt::QueuedConnection);
 }
 
 void ThumbnailHelper::initSizeLimit()
@@ -141,12 +142,16 @@ QString ThumbnailHelper::saveThumbnail(const QUrl &url, const QImage &img, Thumb
     tmpImg.setText(QT_STRINGIFY(Thumb::MTime), QString::number(fileModify));
 
     makePath(thumbnailPath);
+    emit saveImage(tmpImg, thumbnailFilePath, fileUrl);
+
+    return thumbnailFilePath;
+}
+
+void ThumbnailHelper::onSaveImage(const QImage &tmpImg, const QString &thumbnailFilePath, const QString &fileUrl)
+{
     if (!tmpImg.save(thumbnailFilePath, Q_NULLPTR, 50)) {
         qCWarning(logDFMBase) << "thumbnail: save failed." << fileUrl;
-        return "";
     }
-
-    return thumbnailFilePath;
 }
 
 QImage ThumbnailHelper::thumbnailImage(const QUrl &fileUrl, ThumbnailSize size)
@@ -232,10 +237,10 @@ bool ThumbnailHelper::checkThumbEnable(const QUrl &url)
             return false;
     }
 
-    bool enable{ true };
-    if (FileUtils::isMtpFile(fileUrl)) { // 是否是mtpfile
+    bool enable { true };
+    if (FileUtils::isMtpFile(fileUrl)) {   // 是否是mtpfile
         enable = DConfigManager::instance()->value("org.deepin.dde.file-manager.preview", "mtpThumbnailEnable", true).toBool();
-    } else if (DevProxyMng->isFileOfProtocolMounts(fileUrl.path())) { // 是否是协议设备
+    } else if (DevProxyMng->isFileOfProtocolMounts(fileUrl.path())) {   // 是否是协议设备
         enable = Application::instance()->genericAttribute(Application::kShowThunmbnailInRemote).toBool();
     }
 
diff --git a/src/dfm-base/utils/thumbnail/thumbnailhelper.h b/src/dfm-base/utils/thumbnail/thumbnailhelper.h
index 1196f02698..adce85d7dc 100644
--- a/src/dfm-base/utils/thumbnail/thumbnailhelper.h
+++ b/src/dfm-base/utils/thumbnail/thumbnailhelper.h
@@ -15,8 +15,9 @@
 
 namespace dfmbase {
 
-class ThumbnailHelper
+class ThumbnailHelper : public QObject
 {
+    Q_OBJECT
 public:
     explicit ThumbnailHelper();
     void initSizeLimit();
@@ -34,9 +35,13 @@ class ThumbnailHelper
     static QString sizeToFilePath(DFMGLOBAL_NAMESPACE::ThumbnailSize size);
     static QByteArray dataToMd5Hex(const QByteArray &data);
 
+Q_SIGNALS:
+    void saveImage(const QImage &tmpImg, const QString &thumbnailFilePath, const QString &fileUrl);
+
 private:
     bool checkMimeTypeSupport(const QMimeType &mime);
     void makePath(const QString &path);
+    void onSaveImage(const QImage &tmpImg, const QString &thumbnailFilePath, const QString &fileUrl);
 
 private:
     DMimeDatabase mimeDatabase;