Abstract: Precipitation numerical forecast model based on a variety of products, application programming and word form processing tools OLE automation control methods, such as using inverse square lattice interpolation forecasting test of weighted average contour analysis and splash graph method, such as the Three Gorges Reservoir catchment basin surface rainfall forecast by the surface precipitation live test, with the weight set to make the surface precipitation forecast, the average surface rainfall forecast into the points of the three gorges reservoir basin inspection system, implement the points of the Three Gorges Reservoir basin surface rainfall forecast product output and automatic grading test automation, and other functions, improve the precision of surface rainfall forecast objectivity, timeliness and the level of refinement.