Abstract: The radio radar simulator plays an important role in equipment performance test, jamming effect evaluation, teaching and training exercises, technique and tactics optimization research in the field of electronic countermeasure. After brief introduction on the classification criteria of radio radar simulators, the application situation of typical foreign military radio radar simulators is summarized from three aspects: transmitting-only injection simulation, transmitting-only radiation simulation by antenna and transmitting-receiving integrated simulation. The main functions, performances and characteristics of radio radar simulator products are presented. Then the evolution of radio radar simulators in the fields of software, instrumentation, anti-jamming, intelligence, networking cooperation and multi-function integration is briefly analyzed. Its main development trend in the future is shown. It is an important reference for the development of new technology and product application of radio radar simulators.