Abstract: With the continuous extension of the national railway network, the amount of coal under railway line is increasing. To recover coal resources better on the premise of ensuring the safety of railway operation, FLAC^3D numerical simulation, probability integral method prediction and field measurement are combined to study the impact of filling mining technology under railway super-high water on surface railway operation. By setting different mining schemes, FLAC^3D numerical value is applied. The influence of mining activities on surface subsidence is simulated and compared under different filling rates and different working face layouts. The actual width of coal mine working face is 100 m, the filling rate of super-high water is 94%, and the maximum surface subsidence is predicted by probability integral method to be 73 mm; the observation result of ground observation station is 65 mm, which is very close to the filling rate of FLAC^3D numerical simulation of 95%. According to the relevant regulations of railway construction, the surface subsidence meets the requirements of safe passage of railway, and the filling of super high water meets the requirements of environmental protection, economy and effectiveness