Abstract: To reveal the cause and law of the deformation and failure of the roadway along the goaf, the influence of different mining height on gob-side entry retaining is analyzed theoretically. The surrounding rock deformation and stress distribution of gob-side entry retaining of thickened coal seam are analyzed by numerical simulation. The results show that the thickness of the coal seam increases, the subsidence of the roof increases, the support resistance, the filling width and the angle of rotation are increased, the backfill body is seriously deformed and damaged and moves inward to the roadway, and the stress concentration occur at the solid coal and angle of the roadway, and the peak stress is extended to the deep part. When the thickness is small, the deformation of the roadway is not significant, but the stress of the solid coal side is concentrated, and there is a hidden danger of deformation.