Abstract: The complicated topography and irregular characteristics of open pit increase the difficulty of topographic mapping in mining area.In view of the present situation, Putting forward the technical scheme of using the unmanned aerial vehicle tilted photogrammetry to carry out the topographic mapping of the open pit, and studies the practical application of this new technique in the mine surveying and mapping,the research describes the key technical path of using UAV to make flight plan, accuracy control,image data processing and 3D modeling in surveying and mapping of mining area .The results show that the error in the data elevation of the unmanned aerial vehicle can reach to + 0.1M, and the error in the plane coordinates can reach to + 0.08m, which is in line with the precision requirements of the technical design specification for engineering.We can use the technique of unmanned aerial vehicle tilting photography to collect the data of the surveying and mapping of the open pit. The data produced can be effectively used in the production of the open pit, thus improving the utilization of the surveying and mapping results.