Based on the WRF mesoscale numerical model and by using the initial cloud condensation nuclei(CCN) data in NSSL(C=600 cm^-3、k=0.6)and the observation fitting data from the northern suburbs of Nanjing(C=4 000 cm^-3,k=0.47),the paper simulated a strong convective weather event in Anhui Province.The maximum simulated radar reflectivity of CASE1 was 50-55,while that of CASE2 was 55-60.,It was closer to the actual situation in CASE2 than in CASE1 in terms of intensity and width of the cloud,and CASE2 reflected stronger echo.The precipitation area of CASE2 was closer to the reality than that of CASE1,and the precipitation intensity was stronger than that of CASE1.The occurrence of multiple strong echoes made the distribution of heavy rainfall area wider in CASE2.In early stage of CASE2,larger cloud water and ice crystal particle number concentration released more heat when the water particles were frozen and thus made the cloud develop more vigorously than in CASE1.The snow crystal mass and number concentration were similar in the two cases.In CASE2,the water content ratio of graupel and hail particles was higher than that in CASE1,and thus produced stronger cold could precipitation in melting process.