Abstract: The variation trend of thinning rate in one-step drawing and two-step drawing of heat-resistant steel special-shaped exhaust pipes was studied.First, the maximum depth test of 85.43 mm was conducted by using multi-station stamping equipment, and the relationship curve between thinning rate and punch position was obtained.Based on the results of one-step deep drawing test, tests at the maximum tensile depth of 37.42, 85.43 and 48.01 mm were performed respectively.The comparison of the thinning rate of the top and corner dangerous areas was compared, and the thinning rate-punch position curves of the two areas were obtained.The experimental results show that the thinning rate of dangerous corner area is 32.81% in one-step drawing process, and the drawing parts are cracked, so multi-step drawing is needed.In the secondary drawing process, the thinning rate of the corner area of the pre-drawing part is 9.72%, and the thinning rate of the dangerous corner area of the secondary drawing part is 12.18%.The drawing part does not crack.