Abstract: In order to solve the problem of large deformation and difficult control during the operation of the 5 coal return airway in Changcheng No.3 Mine, the reasons for the large deformation of the surrounding rock in the roadway were identified through drilling observation, expert verification, and theoretical calculation, and measures such as support optimization and grouting were proposed to improve the situation.The results showed that the anchor rod with a length of 2 000 mm was replaced with a 4 000 mm anchor cable, and the length of the 5 400 mm anchor cable increased to 7 000 mm.The vertical displacement of the roadway has decreased by 78%,the horizontal displacement has decreased by 71%,and the plastic zone damage area of the roadway roof has decreased.On site industrial experiments have shown that after 100 days, the roadway tends to a stable state.The maximum displacement of the roadway roof is 90 mm, and the maximum displacement of the two sides is 73 mm.The deformation of the surrounding rock of the roadway is relatively small, which meets the safety production conditions.