diff --git a/examples/OptionMaster/etf_portfolio.json b/examples/OptionMaster/etf_portfolio.json
index 8de8b975..ff6c4e4e 100644
--- a/examples/OptionMaster/etf_portfolio.json
+++ b/examples/OptionMaster/etf_portfolio.json
@@ -7,12 +7,12 @@
     "chain": [
         {
             "underlyingSymbol": "510050", 
-            "chainSymbol": "510050-1802", 
+            "chainSymbol": "510050-1804", 
             "r": 0.04
         },
         {
             "underlyingSymbol": "510050", 
-            "chainSymbol": "510050-1803", 
+            "chainSymbol": "510050-1805", 
             "r": 0.03
         },
         {
diff --git a/vnpy/api/huobi/vnhuobi.py b/vnpy/api/huobi/vnhuobi.py
index 24e1e544..e9fa5982 100644
--- a/vnpy/api/huobi/vnhuobi.py
+++ b/vnpy/api/huobi/vnhuobi.py
@@ -107,7 +107,7 @@ class TradeApi(object):
             self.pool.map_async(self.run, range(n))
         
     #----------------------------------------------------------------------
-    def stop(self):
+    def close(self):
         """停止"""
         self.active = False
         self.pool.close()