Abstract:In meso-scale regional climate model RIEMS, BATS model is used as the land surface process model, its shortcoming is that its soil internal process is simpler. In this paper, the 10 layers soil model is introduced in BATS instead of original 2 layers soil model, and some concepts of TOPMODEL hydrological model are used. Then, the temperature and water in soil can be computed more reasonably. 2 cases in summer are simulated ,both periods are a month long.It is shown that the precipitation, sea surface pressure,stream fields on 850 hPa are all simulated better than the original RIEMS, it is an improvement to the original RIEMS model.