Abstract: In order to optimize the cross-section shape of gently inclined semi-coal roadway with high ground stress, the study was carried out with the roadway of 3018 working face in Donghuantuo Mine as the engineering background. The analytic stress solutions of different cross-section shapes in inclined coal seam are derived by the theory of complex variable function, and then the stress concentration and plastic zone of tunnels with different cross-section shapes are solved by FLAC3D numerical simulation, and the optimal cross-section shape of tunnels is determined on this basis. Finally, the reliability of the research results is verified by field industrial tests. The results show that the failure of gently inclined semi-coal roadway is asymmetric under the action of high ground stress; Regardless of the cross-section shape, the roadway presents high stress concentration at the left and right bottom corners, and the stress concentration degree is rectangular > trapezoidal > straight wall arch; The stability of straight-wall arched roadway is the best, followed by trapezoidal roadway, and the rectangular stability is the worst. It is determined that straight-wall arched roadway is the final roadway section shape. The monitoring results of roadway surface dis-placement show that the straight-wall arched roadway can better meet the requirements of on-site safety production.