Abstract: Taking Datong Coal Mine 8107 working face with high mining height as the research background, through the establishment of theoretical mechanics model, the “voussoir beam and cantilever beam” structure formed by coupling high “voussoir beam” structure with low “cantilever beam” structure in process of mining top coal rock, and the reasonable working resistance of support is studied. The working resistance of 8107 working face under normal mining and the pressure was 26 MPa and 40 MPa, the results are more consistent with the theoretical calculation. It shows that the 8107 working face using ZF15000/27.5/42 type four-column low-level coal caving support can meet the production needs.