Abstract: Aiming at the difficulty in water injection of 3^# coal seam at main mining working face in Tangkou Mine, the original water injection project and construction system for 2307 working face were improved. Based on the sampling at injection point, we can obtain the optimal injection pressure was 20 MPa by the inspection of moisture increment and wetting range. Through the investigation of dust removal efficiency, we can draw a conclusion that if the seam water injection and spray dust prevention measures were used together, the dust fall rate was above 80%. At the same time, through the detection of ground pressure, we can see that the stress of coal seam has been effectively controlled by coal seam water injection. It reduces outburst risk greatly at 2307 working face and ensures the safety mining of 2307 working face.