Abstract: According to the severe deformation of floor in gob-side entry driving under the mining influence, the stress distribution characteristics and gradual failure mechanism of gob-side entry driving in different mining stages was studied with the method of theoretical analysis and numerical simulation. The results show that the “given load” and “given deformation” of the coal body at the edge of the goaf together make the displacement and stress distribution of the floor inclined to the solid side after roadway tunneling; when the working face is mined back, the unsymmetrical distribution of stress on the two sides of the roadway is intensified, and the double sliding field of layer distribution of the bottom plate is gradually inclined to the side of the pillar, and the change of the sliding field aggravates the occurrence of floor heave.