diff --git a/ULDataMgr.cs b/ULDataMgr.cs
index 38cfac1..be6a005 100644
--- a/ULDataMgr.cs
+++ b/ULDataMgr.cs
@@ -20,6 +20,18 @@ namespace upper_limit_crawler
 		public float m_fLossCut;
 	}
 
+	public struct BLACKLIST
+	{
+		public BLACKLIST(string strCode, int iTime)
+		{
+			m_strCode = strCode;
+			m_iTime = iTime;
+		}
+
+		public string m_strCode;
+		public int m_iTime;
+	}
+
 	public class ULDataMgr
 	{
 		public SETTING m_Setting = new SETTING();
@@ -27,7 +39,7 @@ namespace upper_limit_crawler
 		ULTrader m_Trader = new ULTrader();
 
 		Dictionary<string, ULWatchItem> m_WatchList = new Dictionary<string, ULWatchItem>();
-		List<string> m_BlackList = new List<string>();
+		List<BLACKLIST> m_BlackList = new List<BLACKLIST>();
 
 		public ULDataMgr()
 		{
@@ -99,12 +111,20 @@ namespace upper_limit_crawler
 
 		public void AddBlackList(string strCode)
 		{
-			m_BlackList.Add(strCode);
+			int iTime = int.Parse(UlUtil.GetCurTime().ToString("HHmmss"));
+			BLACKLIST black = new BLACKLIST(strCode, iTime);
+			m_BlackList.Add(black);
+		}
+
+		bool IsIn5Min(int iTime)
+		{
+			int iCurTime = int.Parse(UlUtil.GetCurTime().ToString("HHmmss"));
+			return (iTime >= iCurTime - 500);
 		}
 
 		public bool IsInBlackList(string strCode)
 		{
-			return m_BlackList.Contains(strCode);
+			return m_BlackList.Any(r => r.m_strCode == strCode && IsIn5Min(r.m_iTime));
 		}
 
 		public Dictionary<string, ULWatchItem> GetWatchList()