Abstract: Mining Subsidence environment evaluation process often need statistical the movement and deformation value of villages, roads, bridges and other buildings, in order to solve the problem that the traditional statistical method efficiency is low, the precision is not high, in this paper, the mining subsidence prediction program is compiled, and the extreme direction formula of surface displacement and deformation in mining area is derived.And according to the different types of construction(structure) constructed from plane geometry shape, divided it into planar, linear and punctual, planar point clouds instead of the building used to subsidence prediction and statistics,The automatic extraction of the extreme value of moving deformation of ground surface construction (structure) in mining area is realized.The method in Nantun coal mine for the specific project application and achieved good results, the research results have important reference value for the evaluation of surface construction (structure) damage in mining area.