Method for preventing and controlling impact geopressure in longwall face gate of coal mine

The invention discloses a method for avoiding the working surface of coal mine impacting the ground, which first arranges an ascending groove, a dig hole and a descending groove in the production area; a coal post on one side of nearby collected area. It is characterized in following steps: arranging guide copper at each 160m of descending groove, while its depth is 6.0m, the width is 3.0m and the height equals to the height of descending groove; drilling de-pressure drill hole with the diameter of 600-850mm in the guide copper which is connected to two de-pressure drill holes of nearby guide coppers; and filling the guide copper. It has the advantages that: the large-diameter drill de-pressure in the ascending groove can change the mechanical property of deep coal, therefore, the inner part of coal which is inclined to impact attains breakage band to release the flexible energy, reduce the impact danger and avoid impacting ground.