Abstract: In order to analyse the relationship between coal seam water injection rate and advance abutment pressure, the site observation was applied to analysis the relationship between coal seam water injection rate and advance abutment pressure in No. 9801 working face of Kaiyuan Mine and obtained reasonable water inject ion process and parameters. The results showed that advance abutment pressure influenced on coal seam water injection rate was obviously. Limit equilibrium interval within 20 m ahead of working face, the growth of coal seam water injection rate was distinct, reached the highest rate 2. 88 m3/ h, 4.5~ 9.6 times the rate of pressure rise area about 20 ~ 35 m ahead of the working face. The region of the advance abutment pressure was the important way to ensure the effect of coal seam water inject