diff --git a/sites.py b/sites.py
index bac0b7b..5fb9960 100644
--- a/sites.py
+++ b/sites.py
@@ -9,15 +9,23 @@ class Sites:
 
     def __del__(self):
         print(self.name, 'stop !')
+        
+    def stop(self):
+        self.to_stop = True
 
     def search(self, key_word):
+        self.to_stop = False
         key_word = self.trns_key(key_word)
         for url in self.gen_url(key_word):
+            if self.to_stop:
+                return
             try:
                 soup = self.fetch_soup(url)
             except:
                 break
             for item in self.get_item(soup):
+                if self.to_stop:
+                    return
                 if 'link_url' in item:
                     try:
                         item['link'] = self.get_link(self.fetch_soup(item['link_url']))
diff --git a/ux.py b/ux.py
index 41317c3..159dac7 100644
--- a/ux.py
+++ b/ux.py
@@ -29,8 +29,9 @@ class Ux(QMainWindow, window.Ui_MainWindow):
         self.state.showMessage('Over')
         if self.timer.isActive():
             self.timer.stop()
-            while self.th_search.isRunning():
-                self.th_search.exit()
+            if self.th_search.isRunning():
+                self.th_search.stop()
+                self.th_search.wait()
 
     def on_cb_source_currentIndexChanged(self, index):
         if type(index) == type(1):
@@ -83,6 +84,9 @@ class SearchThread(QThread):
     def run(self):
         if not self.key:
             return
-        search = self.site(self.to_append_result)
-        search.search(self.key)
+        self.search = self.site(self.to_append_result)
+        self.search.search(self.key)
         self.to_stop_search.emit()
+
+    def stop(self):
+        self.search.stop()
\ No newline at end of file