Based on Japan, Germany, and T639 numerical model gridded forecast products of precipitation from May to September 2008 to 2010, using the method of inverse distance interpolation to downscale, the precipitation of each grid numerical model forecast fields is interpolated to four stations: Yanqing, Miyun, Fangshan, Beijing Meteorological Observatory, which are the representative stations of the northwest, northeast, southwest, southeast of Beijing. Precipitation weather in Beijing can be divided into four categories: westerly trough, Northeast vortex, Mongolia vortex, and other systems. The forecasting accuracy rating method is used to calculate weighting coefficients of numerical prediction models. Then the objective precipitation forecast model is set up. Using independent samples to test the model, the test results show that the objective integration precipitation forecast model is superior to the independent model, which has reference value for summer precipitation forecasting and numerical model application.