Abstract: In order to study the influence of bedrock thickness, unconsolidated layer thickness and mining thickness on the maximum subsidence value of the surface under the condition of shallow coal seam mining, numerical simulation was carried out by using FLAC^3D software, and the degree of influence of the three factors was ranked by orthogonal experiment method, which can be classified as bedrock thickness > unconsolidated layer thickness > mining thickness. By changing the value of three variables, the influence of the three on the maximum subsidence value of the surface was analyzed. Based on the results of numerical simulation, regression analysis was used to fit the comprehensive function expression of the maximum subsidence value and the three factors. The expression was verified by an engineering example. The results show that the comprehensive function expression has high reliability, which can provide a reference for the prediction of surface movement and deformation under similar conditions.