The survivability has been one of the significant technical index formilitary aircraft, and the primary purpose of calculation on vulnerability for aircraft is to evaluate survivability and provide theoretical guidance for enhancement of survivability. This contention about this paper is to be erected power field of focusing warhead, considering demolish of waves for explosions and piercing of global and quadrate devastating element, looking upon static dispersion angle as a design parameter, through simulating flight of the fragment of the focusing warhead in modern airwar. This paper studies vulnerability of multiple hits different devastating elements in power filed of focusing war-head. An example for calculation is showed, compared with conventional warhead that a focusing warhead can make a higher damaging probability for aircraft.