Abstract: The realization of signal environment simulator is an impormant part of automatic test system for radar countermeasuresystem . Taking reconnaissance system as the test object, composition of simulator is analysed, and using Agilent signal generatorand digital signal processing circuit, the simulator is designed to realize the simulation of signal radar pulse ,multiple radar pulse ,video pulse and others. At last ,the description and storage of data using extensible markup language and database is introduced. Itcan fulfill the demand of tset in practice.