The paper studies competitive aerobics athletes body function, after making comprehensive evaluation on one group of competitive aerobics athletes body functions, obtained result is competitive aerobics athletes body function belongs to good level, by making comprehensive evaluation on competitive aerobics athletes body function, it well verifies fuzzy mathematics adaptability and effectiveness, and utilizes performance quantization method, to further research, the paper carries out concrete analysis on three competitive aerobics athletes body function, finally gets the three competitive aerobics athletes body function total performances rank s₁ < s₂ < s₃ , and finally proposes methods to promote competitive aerobics athletes body function, and provides theoretical supports for future researching on competitive aerobics athletes body function.