Abstract: Topographic data of coal mining subsidence is the basis of damage assessment and land reclamation.Based on the mining subsidence of Qiuji coal mine in Shandong province, this paper designs 12 kinds of flight plans.By analyzing such factors as plane precision, elevation accuracy and time cost, this paper explores the consumer-grade unmanned aerial vehicle to get topographic data of mining subsidence and chooses an optimal flight plan.The results show that:increasing the number of control points and overlapping degree of images can effectively improve the accuracy of the aerial image of the consumer-grade unmanned aerial vehicle, however, when the degree of overlap increases to some extent, the magnitude of accuracy improvement tends to be stable; the plane precision of the topographic maps obtained by the 12 kinds of flight plans meets the accuracy requirement of 1∶500.The elevation accuracy meets the precision requirement of 1∶1 000; among them, the layout of 9 image-controlled points and the degree of overlap is set to 9070 or 9080 when the elevation accuracy is highest; under the altitude of 120 m, 9 image-controlled points are laid out, the aerial photography accuracy is the highest when the degree of overlap is set as 9070; when the flight area is larger, consider the time cost, he degree of overlap is set to 8070 cost better.