In order to scientifically evaluate the damage effect against ground armored vehicles, based on the characteristics and mechanism of warhead fragment dispersion formed by projectile proximity explosion in space, a calculation model for evaluating damage to groundarmored vehicles by warhead fragment is established in this paper, and the spatial relationship between warhead fragments formed by projectile proximity explosion and armored vehicles under random intersection state is analyzed. According to the damage mode of armored vehicle parts, the damage criteria of flammable, explosive and vulnerable parts of armored vehicles are studied, combined with the damageweight of components, the damage calculation model of components and the damage probability model of armored vehicle are derived, andthe damage evaluation method under the condition of the number of warhead fragments and penetration area conditional probability isformed. Through calculation and analysis, the damage effect of warhead fragments on armored vehicle is given under the conditions of different projectile explosion position, different incidence angle and different weight difference of vulnerable area of armored vehicle; the calculation results show that in the process of intersection of projectile and armored vehicle, the smaller the projectile proximity explosionheight and the smaller the intersection angle, the greater the damage probability of armored vehicle. From the state of the number of warhead fragments hitting each vulnerable area, the damage of the armored vehicle under the effect of the effective number of warhead fragments is analyzed, the results show that the more the number of effective warhead fragments, the better the damage effect.