An improved ADC assessment model is proposed for operational effectiveness assessment of the reconnaissance Unmanned Aircraft System (UAS).Based on the operational mission and operational process of reconnaissance UAS,a reconnaissance UAS operational effectiveness assessment index system is constructed. Based on the traditional ADC method,taking into account the factors of combatant protection and battlefield environment,the operational effectiveness of reconnaissance UAS is evaluated by using the hierarchical analysis method and the fuzzy comprehensive evaluation method.Finally,the feasibility and effectiveness of the model are verified by arithmetic examples,and the evaluation results show that the improved ADC method makes the reconnaissance UAS operational effectiveness assessment more relevant to the actual combat.