According to the technical prescription of the project "National Weather Radar Terminal Updating and Calibration", a national operational weather radar data processing system is developed and performs well. It achieved the format unification of radar data, the manufacture and distribution of products, and the operational function of image redisplay; and advanced radar observation quality, data processing and product application level. In the course of the system design, such factors are considered as the weather radar operational conditions and requirements, the radar detection technological tendency, and the capability and steadiness of the system, as well as advanced algorithms and the open interface. The system appearance is innovative instead of the traditional dialog box and toolbar in the weather radar software.