Abstract: In order to achieve high absorption and conversion efficiency of thin disk lasers, the method of multiple pumping absorptions was adopted. Combining with the pumping structure of light spot asymmetric parabolic surface and light spot symmetrical aspheric surface, a new method of high pumping passing was proposed to improve the duty ratio of aspheric beam distribution. The multipass pumping structure was designed. The optical path distribution and spot position diagram of 24 passes pumping schemes were simulated by using ZEMAX. Absorption efficiency of thin disk crystal on pump light with different pumping passes was calculated theoretically according to Bill's absorption law. The results show that among the designed pump structures of 24 passes, 36 passes, 40 passes and 80 passes schemes, the absorption efficiency of 36 passes pumping scheme is the most cost-effective. The research has guiding function for the design of small multi-pass pumping structures with high power.