Abstract: Computer generated forces（CGF）behavior in the combat simulation system for element tactics training is closely related with geographical environment characteristics and activities of other entities. The optimization of virtual battlefield environment perception, object management and inquiry method of CGF entities is a key in enhancing confidence level of behavior model and operational efficiency of simulation system. Focused on the perception observation and judgment link in the observe-orient-decide-act （OODA）cycle, firstly, the efficient perception and dynamic management of battlefield space based on the concept of space block is realized. Then, attention mechanism of multi sensory perception （visual and auditory）and instance preference of perceptual subjects are combined, a value model based on perceived attention mechanism is established with ordering of values, thus the horizontal comparison between traditional perception model and the proposed model is conducted. Finally, a tactical-levelsimulation platform of element situational awareness is built based on space block and value model. Based on the simulation results, the conclusion is that the perception method of CGF attention based on spatial block strategy can effectively improve the perception efficiency without losing perception accuracy, it is feasible and effective.