Abstract: Using the China Meteorological Administration Multi-source Precipitation Analysis System(CMPAS) merged precipitation product from the National Meteorological Information Centre from June to August 2021 as the observed precipitation, the forecast deviation characteristics of three numerical models, including the Southwest Regional Numerical Weather Prediction Operational Model (SWC-3km), the GRAPES 3km model, and the European Centre for Medium-Range Weather Forecasts (ECMWF) model poduct, in predicting hourly-scale precipitation over Sichuan during summer 2021 are analyed. The analysis covered aspects such as precipitation amount, precipitation frequency, precipitation intensity, peak time, and diurnal variation. The results showed that the SWC-3km model significantly overestimated the summer precipitation amount in the Sichuan Basin, however, its forecast of high-intensity precipitation areas aligned well with CMPAS. The model could determine whether peak precipitation occurred in the afternoon-night or night-early morning period, the diurnal variation amplitude was quite different from the results of CMPAS. The GRAPES-3km model exhibited precipitation forecast biases in Yibin and Luzhou, while performing relatively consistently in other regions of the Sichuan Basin. The ECMWF model performed well in predicting summer precipitation in the Sichuan Basin, with its forecasts of precipitation distribution, high-value centers, precipitation frequency, and intensity showing good agreement with CMPAS.