Abstract: In order to solve the serious problem of separation layer of coal composite roof of high ground stress in deep well, the roadway of Shanxi Gengyang Coal Mine is taken as the research object. Through the study of roof drilling, theoretical calculation, numerical simulation and engineering practice, this paper discusses the mechanism of seepage failure of coal-bearing composite roof based on the theory of arch-beam coupling support, and proposes the method of “ladder-type beam anchor cable support system” and high-strength anchor joint support method. Through simulation and engineering verification, this kind of support can greatly reduce the roof separation layer and keep the surrounding rock stable.