In this paper, the Electro-optical Countermeasure Hardware-in-the-loop simulation system is introduced, which highlight to problem: real-time control and acquisition of communications data. We discuss the real-time mechanism by the combination of HLA time management mechanism for real-time data communication and out clock, and the double buffer of the acquisition method which ensures high frequency real-time data communications and high data reliability, integrity. The tested data is shown that the Electro-optical Countermeasure Hardware-in-the-loop simulation system work properly.