Abstract: This paper introduces a radar radiating-source recognizing expert system realizing with AUTES(An Universal Developing Tool of Expert System). Especially, it describes the expert system's knowledge-base, certain-factor ftsion computing method and interpreter in detail. The application and testing indicate that the expert system can recognize radar radiating-source effectively.In particulaf, to the radar radiating-source whose parameters are not complete or are aberrant, the recognizing precision reaches to 80%.