Aerobics is a well-received event with lots of body building efficiency. Long-term persist aerobics training can improve health, perfect physical quality, correct deformities , adjust psychological activities and help to cultivate a good temper. This paper takes body building as main research objects, establishes rigid multi-body human model and rigid multi-body sports model so as to provide theoretical basis for aerobics techniques details research by model. Apply experimental grouping method and mathematical statistics method in aerobics players’ each body indicator analyzing to explore aerobics motor functions and provide mass base for aerobics popularization.