Abstract: In this paper, we make comprehensive use of the precipitation forecasting precision point products in Wuhan City to study the relationship between the process precipitation and pumping drainage within the catchment area of a pumping station, and to analyze the relationship between rainfall and flood within the catchment area. Based on the precise precipitation forecast products and the relationship between rainfall and flood, by predicting the hourly critical precipitation during heavy rainfall, the critical precipitation warning for the pumping station area is made, and the number of hours of pumping is predicted. The regional drainage and meteorological dispatch technology of urban pumping station is studied.