This paper utilizes experimental method, questionnaire method to discuss the effect of physical training optimization method and chooses 96 defense cadets as the subjects. The result shows that physical training optimization method is practical and feasible. The scores of arm flex of parallel bars, 3 000-meter-race and 100-meter-race in group 1 defense cadets have obviously improved, which indicates that the adaptable condition of physical training optimization is good and the training practice is rational. Therefore, it is suggested that armed forces should cooperate with colleges and universities to arrange physical training of defense cadets together. Then the comprehensive quality of defense cadets will be improved.