diff --git a/HTS_daily.py b/HTS_daily.py
index 4ce9e40..8f2db78 100644
--- a/HTS_daily.py
+++ b/HTS_daily.py
@@ -122,7 +122,7 @@ class HTS_DAILY (HTS):
 
                     # 다음 조건이면 매수한다.
                     if len(data.index) > 10 and max(bsLine['buy'][len(bsLine['buy']) - 1:]) > 1000:
-                        if not self.orderChecker.exist(today, stock_code, hours=4):
+                        if not self.orderChecker.exist(today, stock_code, hours=2):
                             last_index = len(bsLine['buy'])-1
                             if bsLine['buy'][last_index] > 0:
                                 bs_buy_price = bsLine['buy'][last_index]
diff --git a/hts/OrderChecker.py b/hts/OrderChecker.py
index 6198d66..a27c6cd 100644
--- a/hts/OrderChecker.py
+++ b/hts/OrderChecker.py
@@ -17,6 +17,7 @@ class OrderChecker:
         if os.path.isfile(saveFileName):
             order_df = pd.read_csv(saveFileName)
         else:
+            # type: 매수는 0 매도는 1
             order_df = pd.DataFrame(columns=["datetime", "stock_code", "type", "orderNum", "count", "price"])
 
         if 'Unnamed: 0' in order_df.columns:
@@ -26,7 +27,7 @@ class OrderChecker:
         order_df['datetime'] = pd.to_datetime(order_df['datetime'])
         return order_df
 
-    def exist(self, ymd, stock_code, hours=4):
+    def exist(self, ymd, stock_code, hours=2):
         order_df = self.read(ymd)
         try:
             tmp = order_df.loc[order_df["stock_code"] == int(stock_code)]
@@ -39,16 +40,15 @@ class OrderChecker:
             return False
         return True
 
-    def add(self, ymd, stock_code, type, count, price, orderNum=None):
+    def add(self, ymd, stock_code: str, type: int, count: int, price: int, orderNum=None):
         if self.exist(ymd, stock_code):
             return False
 
         order_df = self.read(ymd)
 
-
         # 새로운 주문을 추가한다.
-        order_df = order_df.append({"stock_code": int(stock_code), "type": int(type), "orderNum": int(0), "count": int(count), "price": int(price), "datetime": datetime.now()}, ignore_index=True)
-        order_df = order_df.astype({"stock_code": int, "type": int, "orderNum": int, "count": int, "price": int})
+        order_df = order_df.append({"stock_code": "A" + stock_code, "type": type, "orderNum": 0, "count": count, "price": price, "datetime": datetime.now()}, ignore_index=True)
+        order_df = order_df.astype({"stock_code": str, "type": int, "orderNum": int, "count": int, "price": int})
 
         # 파일로 기록한다.
         saveFileName = os.path.join(self.RESOURCE_PATH, "order", ymd + ".csv")
@@ -56,16 +56,17 @@ class OrderChecker:
 
         return True
 
-    def delete(self, ymd, stock_code):
+    def delete(self, ymd, stock_code: str):
+
         if not self.exist(ymd, stock_code):
             return False
 
         order_df = self.read(ymd)
 
-        # 매도 주문을 삭제한다.
-        order_df = order_df.loc[(order_df["stock_code"] != stock_code)]
+        # 기존 매수 주문을 매도로 변경 한다.
+        order_df.loc[(order_df["stock_code"] == "A" + stock_code, 'type')] = 1
 
-        # 파일로 기록한다.
+        # 파일로 기록 한다.
         saveFileName = os.path.join(self.RESOURCE_PATH, "order", ymd + ".csv")
         order_df.to_csv(saveFileName)