The skill of the Weather Research and Forecasting(WRF) model in predicting rainfall in the Sichuan Basin during 21 June to 30 July 2012, with three different Planetary Boundary Layer(PBL) parameterization schemes [Mellor-Yamada-Janjic(MYJ), Yonsei University(YSU), and the asymmetric convective model, version 2(ACM2)], was assessed.Results showed that WRF possessed the highest skill amongst the PBL schemes in the 24-h lead prediction for light rain and moderate rain when adopting ACM2.However, the model showed higher skill in the 48-h lead prediction for heavy rain and torrential rain when using the YSU scheme.To investigate the possible causes of the different skill levels with different PBL schemes, we compared the profiles of potential temperature and relative humidity from the observation and simulation at Wenjiang Station.The results showed that the PBL structure was only simulated well by WRF when using the ACM2 scheme during periods of light rain and moderate rain.However, it was captured well by WRF when using the YSU scheme during periods of heavy rain and torrential rain.The different skills of the three schemes in the prediction of rainfall with various magnitudes may be related to their differences in vertical mixing strength.This characteristic is too moist and unstable near the surface in the output of the MYJ scheme.Due to its insufficient vertical mixing, it produces too much spurious rainfall, and so there is a limited ability for the MYJ scheme to simulate rainfall with different magnitudes.Local moisture away from the surface is more easily transported upward by the YSU scheme because its vertical mixing is strong, satisfying the conditions of torrential rain and heavy rain.Therefore, the YSU scheme is suitable for the simulation of heavier rainfall in the Sichuan Basin.The ACM2 scheme features sufficient turbulent mixing strength and, besides, non-local transport will be closed by ACM2 under stable conditions. Therefore, this scheme cannot produce too much precipitation, and is thus more suited to simulating light rainfall and moderate rain in the Sichuan Basin.