Abstract: On the basis of the characteristic analysis of data transmission and interconnection interface in complicated radar real-time signal processing system, a multi-rate data exchange system is designed. Then the structure and composition of this system are described in detail. The system has the characteristics of standardization, modularization and scalability. And through the implementation and application in an airborne SAR signal processing system, the universality and flexibility of this system were proved. The simulation results for multirate data exchange system are developed according to the literature survey on the RADAR signal processing. The RADAR signal processing analysis is accomplished with the help of MATLAB