diff --git a/hgdriver/hgdev/scanner_manager.cpp b/hgdriver/hgdev/scanner_manager.cpp
index a9e0fe2..adc84cc 100644
--- a/hgdriver/hgdev/scanner_manager.cpp
+++ b/hgdriver/hgdev/scanner_manager.cpp
@@ -160,6 +160,13 @@ hg_scanner_mgr::hg_scanner_mgr() : same_ind_(1), user_(""), pwd_(""), cf_name(""
 }
 hg_scanner_mgr::~hg_scanner_mgr()
 {
+    {
+        std::lock_guard<std::mutex>    lock(mutex_dev_);
+        for (auto& v : online_devices_)
+            libusb_unref_device(v.dev);
+        online_devices_.clear();
+    }
+
     usb_manager::clear();
 }
 
@@ -366,7 +373,7 @@ void hg_scanner_mgr::on_hgscanner_pnp(usb_event ev, libusb_device* device, int v
         int index = -1;
         for (int i = 0; i < _countof(g_supporting_devices); ++i)
         {
-            // 064B 澶氬彴璁惧浣跨敤杩欎釜vid锛屾墍浠ュ姞杞芥椂涓嶄細娓呮瑕佹墦寮€鍝竴鍙拌澶囷紝鍙湁閫氳繃澶栭儴杩涜鍔犺浇鏀瑰彉瀹炰緥
+            // 064B 澶氬彴璁惧浣跨敤杩欎釜vid锛屾墍浠ュ姞杞芥椂涓嶄細娓呮瑕佹墦寮€鍝竴鍙拌澶囷紝鍙湁閫氳繃澶栭儴杩涜鍔犺浇鏀瑰彉瀹炰�?
             if (g_supporting_devices[i].vid == vid && g_supporting_devices[i].pid == pid)
             {
                 index = i;
@@ -401,7 +408,7 @@ void hg_scanner_mgr::on_hgscanner_pnp(usb_event ev, libusb_device* device, int v
                     break;
                 }
             }
-            if (add)    // 澶勭悊瀵硅薄鈥渄evice鈥濇敼鍙樼殑鎯呮櫙
+            if (add)    // 澶勭悊瀵硅薄鈥渄evice鈥濇敼鍙樼殑鎯呮�?
             {
                 i = 0;
                 for (auto& v : online_devices_)