Regional precipitation is an important environmental factor and has a great scientific value in the reasonable programming of regional water resources.In this paper,meteorological data of rainfall,wind direction,etc.from 1971 to 2004 were picked up in 14 observatory stations and 8 climate investigation stations.Geography information such as longitude,latitude of the station,sloping direction,and altitude were also included.Prevailing wind-direction effect index and altitude were introduced to reflect climate difference and terrain for precipitation interpolation.Precipitation simulation model in rainy season in the east of Dabie Mountains was built.Spatial precipitation distribution in the east of Dabie Mountains was simulated by using spatial analysis function of GIS for grid data.Simulated results show that in view of different regional characteristics,precipitation simulation precision can be improved by the addition of effective terrain and meteorological factors to participation in interpolation.The relative errors of spatial precipitation distribution simulation in each month and summer and rainy seasons in the east of Dabie Mountains are less than 10%.Precipitation on south and north slopes in the east of Dabie Mountains is characterized by obvious spatiotemporal variation.Mountainous disturbance as a boundary layer has obvious influence on precipitation.Seasonal variation of precipitation on south and north slopes is consistent with seasonal variation of atmospheric circulation.