Abstract: The traditional unmanned aerial vehicle survey technology used in mine survey must carry out the necessary control points measurement, which also makes the unmanned aerial vehicle survey in complex terrain, difficult to access and other areas has a certain application bottleneck.The image-free aerial survey technology is an important trend of mine landform survey, which needs not layout the control points in advance.Taking an open-pit mining area in Kunming City as the research area, this paper carries out aerial photography with DJI phantom 4 RTK UAV, analyzes the key technology and operation process of image free aerial survey technology, and then DOM, DEM, DSM and DLG production, three-dimensional model construction and model internal and external precision analysis are completed.The distribution of geomorphic form and characteristic parameters in the study area are analyzed and counted.The experimental results demonstrate the feasibility of image-free aerial survey technology in the investigation of mine landscape, and provide technical support for the rational development of mineral resources and the maximum restoration of ecological environment.