Abstract: The 10^# coal seam of Xiangqiao Coal Mine are taken as the engineering background, the failure of the floor of the overlying goaf and the deformation of the roof strata of the underlying coal seam were analyzed theoretically, and the coal pressure behavior law between the single coal seam mining and the coal seam mining under the close mined-out area was compared and analyzed by using UDEC numerical simulation software. The analysis results show that: compared with the single coal seam mining, the support pressure stress concentration of coal mining under the close-distance goaf is higher, the strength of advanced abutment pressure is greater, and the roof strata damage of the lower coal seams is more serious than that of single coal seam mining due to coal mining under close-distance goaf belongs to repeated mining. The support strength design of working face must consider the influence of the upper goaf. Thus, when mining under close-distance goaf, the measures that strengthen the advanced support of the underlying coal seam and improve the support strength of the hydraulic support in working face must be taken to ensure the effective management of the roof and safe mining.