Abstract: Abstract: Taking the return wind trough of the 132203 working face of Anshan Coal Mine as the research object, this paper probes into the phenomenon of the broken roof in the early stage of tunneling, obtains the loose ring range of the surrounding rock, calculates the development height of the plastic zone of the roadway roof by using the equivalent circle method. based on this, a new support scheme is proposed. the new support scheme is used in engineering practice, and the deformation of the roadway and the stress condition of the bolt under the two support parameters are observed. the observation results show that the new support scheme is more conducive to maintaining the stability of the roadway.