In order to improve the application ability to T639 model, a synoptic verification about its mediumrange forecasting （120 h leading time） during the summer of 2011 is made in comparison with the counterparts of the models of ECMWF and Japan. The results show that the three models all have good performance on predicting the largescale circulation evolution and adjustment over Asian middle and high latitude areas. As a whole, ECMWF is the best at forecasting synoptic systems and elements among all models. However, the three models have bigger errors on prediction of the track and intensity of typhoon MUIFA except that T639 model performs well after typhoon landing.