To monitor buoy array using UAV in place of manned aerial vehicle is one of important application of UAV in the battlefield of the future for airborne antisubmarine.The case when a UAV executes buoy array monitoring task independently was taken as the background.Analysis was made to the deployment of buoy array during submarine tracking and searching,and the cost function of UAV route was proposed.A rectangular monitoring scheme of the UAV was presented according to the characteristic of buoy array,and the technique index of the planned route was researched.Finally,this scheme was verified through simulation.The simulation result indicates that the scheme is feasible,which provides a theoretic decision-making basis for actual application of UAV in buoy array monitoring in the future.