Combined with the engineering geological conditions of Suntuan Coal Mine in Huaibei, and by using FLAC3D numerical simulation software of fluid-structure interaction function, the numerical simulation is carried out on the Suntuan Coal Mine 1028 working face, the numerical simulation analysis for floor maximum damage depth is 24 m, confined water guide to rise height is 12 m, and working face water inrush accidents will not occur. Meanwhile, the borehole on Suntuan Coal Mine 1028 working face return air lane is arranged, to conduct site resistivity CT detection of coal floor. By analyzing the detection results, it concludes that the largest coal floor damage depth is 17 m, the floor is still full of water-resisting layer, and water inrush will not occur. The test results are compared with the numerical simulation results, and the results of numerical simulation and field measurement are much close.