Abstract: Based on the background of mining roadway in loose broken coal seam, and referred to the supporting mechanism of the soil nailing wall in geotechnical engineering, the two sides deep hole grouting reinforcement technology is proposed. The theoretical analysis shows that the limit equilibrium zone of the soft coal seam roadway is larger, and it is difficult to guarantee the stability of the roadway by the usual bolt anchor cable supporting method. The strength of the two sides of coal body can be improved through the deep grouting technology to rebuild the bearing layer in a certain range. By numerical simulation, the limit equilibrium zone, displacement and stress distribution of the surrounding rock of the roadway are compared and analyzed. It is proven that grouting technology can rebuild the bearing layer, and the side limit equilibrium zone of coal can be controled and the overall stability of the roadway can be improved.