Aerobic exercise is a "young" and loved by people of sports, therefore, in recent years research on aerobics is numerous, this article is on the basis of predecessors' research on aerobics athlete training body posture is analyzed and studied, for the study of the action process of knee joint force analysis provide the image of the space analytic foundation; The two 2-dof rigid body dynamics model was established, for the action process of knee joint torque analysis provides a theoretical basis; Later in this paper, by applying a table in the form of more clearly show the differences between the two aerobics athletes, through the comparison we can draw on the differences between two aerobics athlete was more obvious, therefore, for 1 calisthenics athletes need to shoulder joint control in 65 - degree is more appropriate, and sums up with the increase of the difficulty in the time-consuming, differences between two calisthenics athletes will be more and more obvious, at the same time reflects the calisthenics athletes 1 ability is prominent, through the comparison we found that the elbow of calisthenics athletes under than 1 2 aerobics athlete ability, therefore proves that the no. 1 aerobics athlete's comprehensive strength is strongest. Then by studying the aerobics athlete's habits are drawn in the Angle of minimum right knee joint position with a minimum right knee joint Angle position under the two positions when the joint Angle of the hour, the greater the moment will heavy torque, the greater the muscle torque will increase, the study will be the study of aerobics biomechanics analysis theory plays a certain role in promoting.