This study used the high-resolution operational model CMA-MESO to simulate convective cloud precipitation in Shandong Province using a double-moment microphysical scheme with/without hail. Through comparative analysis, the mechanism of hail microphysical effects of convective cloud precipitation and the predictive ability of the operational model on hail forecasting were studied. The results showed that CMA-MESO simulated the convective precipitation process well. Compared with observations, the squall line life cycle in the model results was similar to the actual situation, and the distribution and magnitude of precipitation were close to the actual situation. The average liquid water and ice water path of the control group (including hail) in the simulated area is smaller than that of the experimental group (without hail). The rising speed of the convective core area in the control group slightly increases during convective development but decreases at other times. When hail occurs, the melting and heat absorption in the control group is stronger than in the experimental group. This might be due to the stronger falling speed of hail compared to other water condensates, which will suppress the development of convection during the falling process. In addition, increasing hail will affect convective precipitation. The proportion of moderate rain (1-10 mm) area to total precipitation area in the experimental group decreased, while the proportion of heavy rain and above (>10 mm) area to total precipitation area slightly increased. In terms of precipitation, with the increase of hail, there is no significant change in the intensity of medium to light precipitation, while the intensity of heavy rain precipitation increases.