Abstract:In order to improve the ability to use the products of GRAPES model, the 15 and 30km GRAPES model products in the whole summer of 2007 was verified. The results shows that the GRAPES models have good forecasting performance in aspect of pre dicting the position of precipitation, however, the two types of GRAPES models h ave the smaller precipitation intensity than the real observational precipitation at the Huaihe River Basin in the first ten days of the July. The position of average trough and ridge is consistent wi th that of the analytic data at 500hPa geo-potential height field. The forecast efficiency of 15km model is better than that of the 30km model for the height fi eld in Indian peninsula and western Pacific region. The position of north bounda ry of 5880 geo-potential meters is also close to the analysis field, but the wes tern ridge spot of subtropical high is eastward in comparison with the analysis field. The temperature transitions at 850hPa are all reflected by the two types of GRAPES models, and the temperature simulated by the 15km model is close to ob servations. Some errors of GRAPES models were found in predicting path and inten sity of typhoon SEPAT. The center of circulation is not evident before the SEPAT lands our main land and the wind speed is obviously small.