In order to better use the T639 products, some synoptic verifications about its mediumrange forecasting in 2008 summer are made in compariso n with the counterparts of ECMWF and Japan models. The results show that three mo dels have good performances in the aspect of predicting the largescale circula tion evolution and adjustment in Asian middle and high latitude area. As a whole, ECMWF model is better in forecasting most weather systems compared with the T63 9 and Japan models. Especially, T639 model has a large error in predicting path and intensity of typhoon FUNGWONG, whereas ECMWF and Japan models are relative ly accurate.