diff --git a/server/backtask/service/user.go b/server/backtask/service/user.go
index f59ff6dc..96bfebe4 100644
--- a/server/backtask/service/user.go
+++ b/server/backtask/service/user.go
@@ -127,3 +127,64 @@ func AddGameLog(accountId string, logType string, subType string,
 		func (err error, lastInsertId int64, rowsAffected int64) {
 		})
 }
+
+func UserAddDiamond(accountId string, diamondNum int32, netId int32, tokenId string, reason int32) bool {
+	var oldDiamond float64
+	{
+		f5.GetGoStyleDb().OrmSelectOne(
+			constant.GAME_DB,
+			"t_user",
+			[][]string {
+				{"account_id", accountId},
+				},
+			func (err error, ds *f5.DataSet) {
+				if err != nil {
+					return
+				}
+				if ds.Next() {
+					oldDiamond = q5.ToFloat64(ds.GetByName("diamond"))
+					AddGameLog(accountId, jccommon.GAME_LOG_TYPE_BACKTASK_USER_ADD_DIAMOND_START,
+						q5.ToString(reason),
+						q5.ToString(netId), tokenId, q5.ToString(oldDiamond), q5.ToString(diamondNum))
+				}
+			})
+	}
+	result := false
+	f5.GetGoStyleDb().Update(
+		constant.GAME_DB,
+		"t_user",
+		[][]string {
+			{"account_id", accountId},
+		},
+		[][]string {
+			{"!diamond", func () string {
+				return fmt.Sprintf("diamond + %d", diamondNum)
+			}()},
+		},
+		func (err error, lastInsertId int64, rowsAffected int64) {
+			result = err == nil
+			if err != nil {
+				return
+			}
+		})
+	{
+		f5.GetGoStyleDb().OrmSelectOne(
+			constant.GAME_DB,
+			"t_user",
+			[][]string {
+				{"account_id", accountId},
+				},
+			func (err error, ds *f5.DataSet) {
+				if err != nil {
+					return
+				}
+				if ds.Next() {
+					newDiamond := q5.ToFloat64(ds.GetByName("diamond"))
+					AddGameLog(accountId, jccommon.GAME_LOG_TYPE_BACKTASK_USER_ADD_DIAMOND_END,
+						q5.ToString(reason),
+						q5.ToString(netId), tokenId, q5.ToString(oldDiamond), q5.ToString(newDiamond))
+				}
+			})
+	}
+	return result
+}
diff --git a/server/jccommon/constant.go b/server/jccommon/constant.go
index 7a4323c6..438938ef 100644
--- a/server/jccommon/constant.go
+++ b/server/jccommon/constant.go
@@ -96,6 +96,8 @@ const (
 const (
 	GAME_LOG_TYPE_BACKTASK_USER_ADD_GOLD_START = "backtask.user_add_gold.begin"
 	GAME_LOG_TYPE_BACKTASK_USER_ADD_GOLD_END = "backtask.user_add_gold.end"
+	GAME_LOG_TYPE_BACKTASK_USER_ADD_DIAMOND_START = "backtask.user_add_diamond.begin"
+	GAME_LOG_TYPE_BACKTASK_USER_ADD_DIAMOND_END = "backtask.user_add_diamond.end"
 )
 
 const (