Summer monsoon precipitation in 1998 is simulated with different soil temperature and solar short wave radiation parameterization schemes using the improved p-nine level hybrid coordinate model.It is found that the improved soil temperature calculation method together with Lacis and Hansen short wave radiation parameterization has a good simulation for precipitation.Statistical test is also made,indicating that the soil temperature has great impact on the precipitation distribution.Compared with the observed field,this model simulated the precipitation better in some periods,while worse in other periods,such as for the strong precipitation process.