Abstract: In order to study the influence of super thick seam filling mining on migration of overlying strata, and ensure the normal use surface settlement of road, using PFC^3D as the simulation platform, the model is built by PFM (Particles Fall Method) and simulation analysis. Considering the combination of three kinds of filling rate and 7 kinds of goaf length, strata movement and stress change laws are obtained, which satisfies the settlement of filling mining scheme. Simulation results show that in the case of complicated geological structure, the change of the main affected deformation area and the loose accumulation area has certain laws; rock 4 plays an important role in the process. According to the simulation results, the filling rates and the corresponding length of goaf satisfied settlement conditions are obtained.