diff --git a/SiNan.Business/AutoTaskBusiness.cs b/SiNan.Business/AutoTaskBusiness.cs
index e48ca13..b724b1c 100644
--- a/SiNan.Business/AutoTaskBusiness.cs
+++ b/SiNan.Business/AutoTaskBusiness.cs
@@ -14,7 +14,7 @@ namespace SiNan.Business
 
         public void ClearHistoryData()
         {
-            var timeOutDate = DateTime.Now.Date.AddDays(-60);
+            var timeOutDate = DateTime.Now.Date.AddDays(-40);
 
             var campaignList = fsql.Select<JDPopularizeCampaign>().Where(c => c.Date <= timeOutDate).ToList<HistoryJDPopularizeCampaign>();
             var adGroupList = fsql.Select<JDPopularizeAdGroup>().Where(adg => adg.Date <= timeOutDate).ToList<HistoryJDPopularizeAdGroup>();