Considering the operational application and the characteristics of equipment performance, and based on the analysis to the horizontal reconnaissance scope and the precise direction finding zone of dual shipborne UAVs, models of dual aircraft feasible locating area, dual aircraft effective precise location area and maximum inscribed rectangle in dual aircraft effective precise locating area were established, and the relationship between dual aircraft effective precise locating area and equal circular error probable curve was analyzed. Practical conclusion was obtained by simulation, which provides a decision making basis for optimal configuration of search power when destroyer/frigate formation adopting dual UAV passive locating.