When mine filling method was adopted to improve the production, filling height directly decided the filling velocity and filling cost, Xima Mine N-1205 and N-1206 working face were mining with paste filling. Probability integral method, the mathematical model was adopted to expect surface subsidence of N-1205 and N-1206 working face up and down boundary, which ensured the various deformation limit value under the condition of highway safety guarantee, the deformation limit value when the deep relationship with the filling height was calculated, the result showed that filling height could be reduced with large mining deep to reach the goal of improving the filling speed, reducing the filling cost.
