Abstract: According to actual engineering, by using the Fuzzy measure model in fuzzy mathematics, the ground deformation and displacement due to underground mining under complex conditions is considered as a fuzzy event in this paper. The ground movement and deformation due to underground coal mining is analyzed and researched. The theoretical formulas of surface subsidence, horizontal deformation, tilt and curvature are deduced. At the same time, the BP neural network method is used to determine the related parameters of the model. An engineering example analysis shows that theoretical result is consistent with the actual situation.