Abstract: In view of the environmental damage and safety hazards caused by surface subsidence during coal mining,taking the 20101 deep-buried and large-mining-height working face of Dahaize Coal Mine as the research object,the surface subsidence law in the mining process was studied by field measurement and numerical simulation. The results show that: The surface subsidence curve is in the shape of, bowl bottom, in the strike direction,and is symmetrical along the central axis of the working face in the inclined direction. The maximum subsidence range of the surface is “circular” at the initial stage,and as the working face continues to advance,the maximum subsidence area gradually develops into “oval”. The measured maximum surface subsidence is 944 mm,and the subsidence coefficient is 0. 157. The simulated maximum surface subsidence is 1 021 mm,and the surface subsidence coefficient is 0. 17,which are abnormally small. It is further analyzed that the reason for its abnormal smallness is that there are a large number of weak cemented strata in the overlying strata,which results in the large overall stiffness and strong anti-energy accumulation ability of the thick and weak cemented overburden,which leads to the serious smallness of surface subsidence when the mining degree is small.