Abstract: In order to quantify the coal mining influence degree to the buildings in the mining area and to optimize the reinforced design to resist the mining influenc es, the stress and deformation features of the buildings in the mining area should be analyzed. In combination with the project cases, the ground surface deformation v alue of the frame structure building in the mining area was analyzed and calculated. According to the deformation and failure conditions of the building, the basic princip le of the building mechanics was applied to analyze and identify the causes of the building failures. Then the fitting calculation method was applied to calculate the defo rmation value of the building and a comparison and analysis was conducted on the two calculated deformation values. The results showed that the surface ground subsi dence value of the mining area was 65 mm, the displacement value of the building basis was 30 mm and the surface ground deformation value and the actual deformati on value of the building were different. A new method was provided to quantify the additional load of the building in the mining area and to conduct the related reinforce d design and the reinforcement cost of the building could be reduced about 30%.