According to the mechanism of the AgI seeding and function, the AgI seeding course was coupled into the operational mesoscale WRF model with reasonable boundary and initial conditions. Then the model is applied to analyze convective precipitation enhancement over the Tianmu Lake in Liyang. The results from analysis of real data and numerical simulation show that: (1)The model successfully simulates the convective system influencing the Taimu Lake region at Liyang. (2) After seeding the strong echo area extends, the average echo intensity increases significantly and the rainfall on the ground increases. (3)The microphysical analysis show that after seeding the content of the ice, snow and grauple increases, correspondingly the content of the rain water at the lowlevel increases as well, which results in the enhancement of the precipitation. 