diff --git a/modules/smithy/api_rise.go b/modules/smithy/api_rise.go
index f55abe818..a70210449 100644
--- a/modules/smithy/api_rise.go
+++ b/modules/smithy/api_rise.go
@@ -44,7 +44,7 @@ func (this *apiComp) Rise(session comm.IUserSession, req *pb.SmithyRiseReq) (cod
 			N: raise.N * req.Count,
 		})
 
-		if stove.Temperature+req.Count*raise_temperatureNum >= (conf.MaxTemperature - raise_temperatureNum) {
+		if stove.Temperature+req.Count*raise_temperatureNum >= (conf.MaxTemperature + raise_temperatureNum) {
 			code = pb.ErrorCode_SmithyMaxTemperature
 			return
 		}