With the battlefield electromagnetic environment become more complex, these also weaken operational effectiveness of information technology equipment. Therefore, to seize the electromagnetic superiority become the key of the war in the information control and then take the initiative. In view of the complicated electromagnetic environment simulation, this paper studies the hardware and software of complex electromagnetic environment simulation system. The system has the function of electromagnetic signal parameters editor, multi-domain real-time monitoring function, parameter real-time control function, test evaluation function, the target database management function and system configuration function. To improve the ability of combat troops in complex electromagnetic environment is of great significance.