In order to improve the ability of artillery commanders to scientifically use fuel air explosive (FAE) to accurately plan firepower, it is necessary to find out its shooting efficiency first. By analyzing the mechanism and characteristics of FAE, the firing error model, typical target model and damage probability model of battalion, company and single gun were established, and the damage degree of bunker targets was calculated under different ammunition consumption of different firing units. The results show that the damage probability of the three kinds of shooting units to the target increases with the increase of ammunition consumption, which is approximately linear. The analysis has important reference value for artillery commanders and their command organs to plan firepower accurately, use ammunition scientifically and distribute firepower correctly.