Abstract: Two different planet boundary layer parameterizations (YSU、MRF) with three land surface model (RUC、SLAB、Noah) in WRF model are used to simulate the heavy rainfall in eastent Sichuan during May 1-3, 2011.The different parameters of the program with different land surface model contrast experiment shows that the WRF model can forecast effectively 24h rainfall intensity and area, but the forecast capacity of precipitation per hour in the single station needs to be improved;different PBL parameterization and land surface model contrast experiment shows that the precipitation has certain sensitivity on PBL parameterization, the differences between every experiment mostly on the forecast of the center of heavy rainfall and peak value of rainfall and peak periods;WRF model is essentially to simulate the diurnal variation of boundary layer elements.