Currently, blasting power test is often used to compare lethality of same type of warhead, and throwing crater volume which forms after the explosion is used to evaluate the size of its power in range. Through theoretical analysis, the effect of different factors on the results of blasting power was calculated. Combined with ANSYS / LS-DYNA and range test, the power of warhead blast at different depth was analyzed. The results show that the crater volume depends not only on the size of warhead quality, soil properties, warhead buried depth and other parameters, but also depends on the warhead shell material. There is an optimum depth for warheads with different charge quality, at this depth, the volume of throwing crater achieves maximum.