Abstract: During the influence of mining dynamic pressure on the 3308 fully mechanized mining face, the 3306 transportation trough of Wangpo Mine experienced full section deformation due to strong compression of the two sides, broken and sinking of the roof, and bottom heave of the floor. In order to reduce the harmful deformation of the reserved roadway in the 3308 mining face and avoid severe deformation and damage of the surrounding rock of the reserved roadway, secondary maintenance is carried out. Deep hole shaped energy blasting pre splitting and pressure relief technology is used on the top plate of the 3308 return air passage. FLAC^3D simulation shows that after the adoption of top cutting measures, the range of high stress areas and high stress concentration coefficient near the upper end area show a significant reduction trend. The vertical stress peak value in the top and bottom rock layers of the reserved coal pillar decreases by more than 20%. Peening shows that there are more obvious longitudinal blasting cracks in the rock mass within the range of 10 m to 25 m upward. Field measurements show that after pre splitting, the cumulative displacement of the top, bottom, and two sides of the coal pillar decreases by 60% and 40%, respectively, The deformation speed of the top and bottom plates decreased by 44%.