Abstract: The Agent is the new technology in the artificial intelligence. It has some characteristic. In this paper we discuss the radar signal identify in the ESM prototype. The features of self-study and self-determination of agent are more emphasized. It is different between knowledge and faith in the cognitive process, Its characteristic is that the database is separated into knowledge database and faith database. and this system can be self-improved by means of the interaction,parameter comparing,weighted methods and data exchange between knowledge and faith bases. The electromagnetic interference would hold artificial intelligence and can adapt the variety of electromagnetic environment through using artificial knowledge in the ESM system.