diff --git a/worldsrv/welfmgr.go b/worldsrv/welfmgr.go
index 6432232..dc0c66b 100644
--- a/worldsrv/welfmgr.go
+++ b/worldsrv/welfmgr.go
@@ -1918,6 +1918,10 @@ func (this *WelfareMgr) UpdateDiamondBankData(p *Player, coinNum int64, isWin bo
 		}
 		return 0
 	}
+
+	if p.WelfData.DiamondBank.DayBuyTimes == fGetPropValue("DayBuyMaxCntDiamond") {
+		return
+	}
 	WinCoinRate := fGetPropValue("WinCoinRateDiamond")
 	LoseCoinRate := fGetPropValue("LoseCoinRateDiamond")
 	addDiamond := float64(0)