Abstract: According to the concentrated stress moving forward problem occurred during the process of eliminating the mine pressure bumping and coal and gas 0 utburst danger in the coal mining face with seam water injection in Xinxing Mine, the mechanism of water injection to wet coal body, reduced the seam support capacity, which would cause the stress moving forward was analyzed.In combination with the geological conditions of Xinxing Mine, a numerical simulation was conducted on the borehole water injection process. The concentrated stress moving forward after the water injection, coal wall displacement increasing and the vadose field distribution C ondition around the water injection borehole were analyzed.The study results of the numerical simulation and the theoretical analysis results were same.A formula for th e permeability radius of the water injection borehole and the stress moving forward distance was inferred when the water injection time conducted at the certain time.