It was verified and compared that the performance of T639, ECMWF and Japan model about their mediumrange forecasting during Dec. 2008 to Feb. 2009. The result shows that the three models have good performances for the evolvement and adjus tment of atmospheric circulation situation in Asia middle and high latitude area , and also for the temperature trends of 850hPa. The prediction error of ECMWF m odel is minimal in that of the three models. They all show significant indicatio n to forecast the transition and disaster weather processes, and have successful ly predicted the atmospheric circulation situation and main effecting synoptic s ystems of the three cold wave processes on a national scale, and continuous rain fall weather process occurring in the middlelower reaches of Yangtze River.