Abstract: In order to solve the problem of the signal processing algorithm upgrade and the dual polarization upgrade in the new generation of weather radar, a standardized signal processing system is developed in this paper. Adopted the idea of designing the software radio system, we divide the signal processing in accordance with the processing of different objects, then the divided categories of processing functions are capsulated into different platforms, and let the signal processor and the computer software to process signals respectively. This design architecture is open and flexible, inheritable transplantation and upgrade quickly. The signal processing algorithm procedures on this system platform can make the achievements of the most advanced weather radar signal processing at home and abroad to be transfer to applications quickly and can be expanded to all kinds of weather radar system as well. Meanwhile, on the hardware design, the signal processor has a good performance to support the double polarization weather radar upgrades, to have the standardized characteristics. By changing the module, it can solve the technological differences of signal processor in the used versions of various sizes in the history. With applying the weather radar of this system, the accuracy and comprehensiveness of weather targets are greatly improved in the observation.