In order to improve the ability to use the products of T639, some synoptic verification on its medium range forecasting in autumn 2012 are made in comparison with the NWP of ECMWF and Japan models. The results show that the three models have good performances in the aspect of predicting the large scale circulation evolution and adjustment in Asian middle and high latitude areas. As a whole, the ECMWF model is better in forecasting most weather systems compared with the T639 and Japan models. Taking tropical storm No.1223 (Son Tinh) as an example, it is found that the ECMWF model gets the most reliable results, whereas T639 and JAPAN models have large deviations in forecasting the turning track of Son Tinh.