Along with the development of new concept weapon and information ammunition，the measurement accuracyof impact is required to be improved gradually in sea fire test. In this paper，the accurate measurement of the impact isproposed based on the UAV shooting and simulatedtarget region. Through the analysis of computational procedure andsimulative calculation of the distribution of impact points affecting on the accuracy，the measurement principle is proved tobe feasible. The precision can meet the demand of less than 5 m within 100 m range. The research results have a guidingsignificance for the measurement scheme design of the impact point at sea.