Abstract: Aim To discuss the architecture and realization of signal processor in ECM measuring radar emulation system. Methods According to the principle of openness, modularization, standardization and programming, the reconfigurable VXI bus system with high transferring speed and the programmable DSP processor with very high processing speed were used. Results and Conclusion The signal processing function based on ECM measuring radar simulator is finished by the processor of radar simulator while the function evaluating electronic interference is realized. The processor has several advantages in programming, reliability and standardization.