Abstract: The rainfall process from June 15 to 21 and No.4 Xijiang flood and No.2 Beijiang flood occured in the Pearl River basin in 2022 were reviewed from two aspects of precipitation and flood forecasting, some problems found in the analysis, for example the numerical forecast of rainfall was inaccurate, the information of water project was insufficient, and the forecast nodes were not divided in detail were summarized. The relevant suggestions can provide reference for further flood forecasting work in the Pearl River basin in terms of scientific application of rainfall forecast, timely optimization of runoff generation and concentration parameters, orderly refinement of forecast schemes, and timely grape of the operation information of water conservancy projects.