diff --git a/backup-daemon/myprocess/mountbackupprocess.h b/backup-daemon/myprocess/mountbackupprocess.h
index 82afbe0..aa11598 100755
--- a/backup-daemon/myprocess/mountbackupprocess.h
+++ b/backup-daemon/myprocess/mountbackupprocess.h
@@ -13,7 +13,7 @@ public:
 
     bool umountBackupPartition();
 
-    static bool umount(const QString& mountPath);
+    bool umount(const QString& mountPath);
     bool mount(const QString& source, const QString& target, const QString& options = "");
 
 private:
diff --git a/backup-daemon/udisksystemrestoreproxy.cpp b/backup-daemon/udisksystemrestoreproxy.cpp
index ab4d704..57ca28f 100755
--- a/backup-daemon/udisksystemrestoreproxy.cpp
+++ b/backup-daemon/udisksystemrestoreproxy.cpp
@@ -322,10 +322,10 @@ bool UDiskSystemRestoreProxy::doPrepare()
         Utils::mkpath(dstImgMountPath);
 
         // 2、先卸载/backup/imgbackup上的mount
-        MountBackupProcess::umount(dstImgMountPath);
+        MountBackupProcess *processMount = new MountBackupProcess;
+        processMount->umount(dstImgMountPath);
 
         // 3、将img文件挂载到/backup/imgbackup上
-        MountBackupProcess *processMount = new MountBackupProcess;
         if (!processMount->mount(imgPath, dstImgMountPath)) {
             emit checkResult(int(BackupResult::RESTOREDIR_PREPARE_FAILED));
             return false;