Abstract: Set up observation points on the surface of the 12040 working face, use RTK to measure the coordinate changes of the surface observation points, and study the law of surface movement and deformation during the advancement of the working face. Establish a numerical simulation model to simulate the surface subsidence during the advancing process of the working face, and obtain that as the advancing distance increases, the surface subsidence gradually presents an approximate symmetrical distribution form. Based on the comprehensive on-site observation situation and numerical simulation conclusions, the results are basically consistent.