The simulation mode of ejection seat with track separate rocket based on the HTY-8 seat was presented in this paper. Through simulation, the affection of track separate rocket to the ejection track at the different rocket impulses and various ejection conditions were analyzed. The results showed that the rocket was needed at the condition of zero or lower velocity. However, the function of track separate rocket was inconspicuous at the ejection condition with velocity. The paths of X direction were separated because the front and aft crew member ejection had certain time interval. The front seat movement track after the crewmember and seat separation was needed to analysis in order to research the function of track separate rocket at the condition with velocity. Under the condition of adverse attitude, the function of rocket was unobvious at roll condition; however, rocket could separate the ejection path at pitch condition.