Abstract: In order to solve the problem of the selection of bolt grouting support parameters and the problem that there is no clear basis for the range of grouting reinforcement in the water rich roadway, this paper takes the water rich roadway in the mountain on the boundary of Ⅱ1 mining area of Taoyuan Coal Mine as the engineering background. By means of theoretical analysis, numerical simulation and field monitoring, the relationship between the thickness of grouting reinforcement circle and the bearing capacity of grouting reinforcement is analyzed, and the optimization method of supporting parameters of water rich roadway based on the thickness of grouting reinforcement circle is proposed. The research shows that: the minimum thickness of grouting reinforcement circle is 1.5 m, and the bolt grouting support scheme based on the thickness of grouting reinforcement circle can effectively control the deformation of deep water rich roadway and ensure the stability and safety of roadway.