Abstract: Gob-side entry is of great significance for improving coal recovery rate, improving roadway stress environment and ensuring mine safety and efficiency. In this paper, the concept of equivalent load is introduced based on the roof load strip division method, and the main control factors of floor heave deformation are analyzed by FLAC3D numerical calculation, and the floor heave control technology is proposed. The conclusion is as follows: The main reason for the serious floor heave is that the coal body in the plastic zone of the coal wall and the supporting body beside the roadway are under the action of high stress after the advancing of the working face, which leads to high stress shear failure and tensile failure of the floor rock. By optimizing the support scheme, the roof cannot collapse in time after the advancing of the working face, which can effectively reduce the heave deformation of the retaining floor. Moreover, the pouring design of the side filling body against the hill, the optimization of the matching of the side filling body parameters and the strength of the floor rock, and other prevention measures for the retaining floor heave along the gob are put forward, which provide reference for similar mines.