Abstract: Small unmanned aerial vehicles(UAVs)currently perform tasks in the form of autonomous navigation. This paper in-tegrates the UAV operation company task data and computer imaging,draws the area covered by the historical trajectory for digital analysis of the picture,uses the bubble algorithm to edit and calculate the computer code,and determines the maximum deviation be-tween the trajectory and the predetermined line. The basic concept and generating factors of the UAV track protection zone are defined for the first time,and the maximum yaw distance is combined with the ICAO8168 regulations. The design specification of the UAV track protection zone under the current navigation accuracy is calculated,and the actual design flight test is verified by using the ob-tained design specifications.. The verification results show that the use of the UAV track protection zone can make multiple UAVs take off at the same time,increase the number of mission vehicles in the unit airspace,and shorten the total execution time of the mis-sion,thus achieving the purpose of safety control.