Abstract: By using T213 and ECMWF model products,the multi-model compositive MOS method has been researched and tested in temperature forecasting.And it has been compared to the single-model MOS method also.It has been found that multi-model method overmatch the single-model method in forecasting obviously.The multi-model MOS method can use useful information and advantages of multiple models' products and make better forecast.In system designing,the identification of factors has been drawn into to solve the problem of multi-model data complexity.During the test,it has been found there are some obvious differences of temperature forecasting in each season.Especially the summer's level is higher than the other three seasons.The main reason is that the daily minimum and maximum temperature changed less in summer then in the others.It makes the forecast to be more easily.But the MOS method still devotes great contributions.