Abstract: In order to solve the problem that the influence of broken coal body on working face finishin,the ground stress distribution state is analyzed by ground stress test; mining pressure characters, abutment pressure are analyzed by software FLAC^3D, then high pressure grouting is used to reinforce the coal near the stop mining line, the grouting pressure is 25 to 30 MPa. Modified cement liquid is developed to improve the cohesion between coal and cement, the cohesion between coal and cement is 1.2 MPa, and gas drainage hole is reused by grouting hole-forming, the working face enclosure only last 11 days. The grouting result is checked on site, the results show that the working face is integrity, and grouting result is great.