This article takes Ping'anbao Mine as the engineering background, and conducts on-site secondary stress measurement, rock mechanics parameter testing, and numerical simulation analysis of the excavated roadway. The maximum principal stress measured is σ_max=6.68MPa, which is 2.56 times the self weight stress; Secondly, with the help of FLAC^3Ddisplacement inversion, the distribution of secondary stress field after tunnel excavation was clarified, and the horizontal stresses were determined to be σ_x=5.0 MPa and σ_y=4.0 MPa, respectively. Finally, grouting with anchor rods and cable support was proposed. The on-site practice measured that the roof displacement decreased from 300 mm to 239 mm, a decrease of 21%, and the floor heave decreased from 226 mm to 115 mm, a decrease of 49%, effectively controlling the serious deformation problem of high stress tunnels.