diff --git a/DataSaver/MainForm.cs b/DataSaver/MainForm.cs
index e10d577..23a4ede 100644
--- a/DataSaver/MainForm.cs
+++ b/DataSaver/MainForm.cs
@@ -316,12 +316,11 @@ namespace DataSaver
                     list.Add(dic);
                 }
 
-                if(date.Minute == 0 && saveFlag)
+                if(date.Second == 0 && saveFlag)
                 {
                     list = list.OrderBy(t => ((DateTime)t["DateTime"])).ToList();
 
-                    var beforeDate = date.AddHours(-1);
-                    beforeDate = beforeDate.AddMinutes(-1 * beforeDate.Minute);
+                    var beforeDate = date.AddMinutes(-1);                    
                     beforeDate = beforeDate.AddSeconds(-1 * beforeDate.Second);
                     beforeDate = beforeDate.AddMilliseconds(-1 * beforeDate.Millisecond);
 
@@ -331,10 +330,14 @@ namespace DataSaver
                     
                     var dicList = list.Where(t => ((DateTime)t["DateTime"]) >= beforeDate && ((DateTime)t["DateTime"]) < recentlyDate).ToList();
                     DBConnection.QueryInsertExcuter_VerifyTickerData(dicList, beforeDate);
-                    list.RemoveRange(0, dicList.Count);
+
+                    foreach(var item in dicList)
+                    {
+                        list.Remove(item);
+                    }                    
                     saveFlag = false;
                 }
-                else if(date.Minute == 1)
+                else if(date.Second == 1)
                 {
                     saveFlag = true;
                 }
@@ -357,7 +360,7 @@ namespace DataSaver
                 //    //hour = date.Hour;                    
                 //}
 
-                Thread.Sleep(500);                
+                Thread.Sleep(1000);                
             }
         }