With WRFV3.4 meso-scale numerical prediction model, three microphysical process schemes(Eta, Kessler, Lin) and convection parameterization schemes (KF, BMJ, GD) were selected to simulate the heavy rainfall in Anhui province on July 12-14, 2012. Comparion between simulation and observation found that the microphysical process scheme affects the intensity, position and range of the heavy rainfall, while the convection process scheme influences the range, position of raim belt of heavy rainfall. Comparison between the simulated and the observed hourly precipitation found that the diurnal variation of precipitation simulated by tests Eta-GD and Lin-GD are more similar to the observation. The results of TS score, ETS score and system bias analysis reveal that the Eta-GD scheme test is the best in the simulation of this precipitation process.