At present, stability evaluation of warhead is difficult in ammunition identification test because of limitation of missile quantity. In this paper, according to compression strength data got by confining pressure test of warhead charge, using AUTODYN mathematical simulation system to calculate or test method to obtain the maximum stress of warhead during collision. Based on stress-strength interference theory, a new method was presented for evaluating stability of warhead. This method is not only scientific and reasonable, but also can greatly reduce test cost.