Abstract: Based on the difficulties of traditional gob-side entry driving technology under deep complicated geological conditions, the technology of coal body and filling body co-protecting roadway and excavating roadway along the gob is proposed. The technical parameters of the backfilling in the roadway, the force of the contact surface between the coal body and the filling body, the two sides mechanics model, the influence factors of the plastic zone and the influence of the gas pressure are studied. The results show that the optimum width of the coal body filling body is 6 m at Ⅲ3302 working face, and the whole deformation of the surrounding rock in the roadway is within the controllable range without instability. It shows that the technical scheme achieves the desired control effect.