By using observation data of mesoscale automatic station in Anhui and statistic data, the influence of Jiuhua Mountain underlying surface on the distribution and intensity of precipitation has been discussed， and the role played by underlying surface physical processes in the precipitation has been analyzed. The results show that the heat and humid conditions and its unstable energy in mountainous area are stronger than in surrounding areas. The thermodynamic effects of nonuniform underlying surface and the mountainous topography 〖HJ〗lead to ground wind field convergence， and the resulting vertical ascending motion strengthens lowlevel jet, which affects the formation of strong convective weather and development. The topography in mountainous area has an obvious effect on the rainfall distribution. The mean annual precipitation, precipitation days and intensity are significantly stronger than others in the peripheral hilly area. Precipitation is significantly enhanced at the windward slope and greater at higher mountains. The study on automatic weather station data gives a good indication of nowcasting for the formation, development and decay phases of a rainfall event in mountain.