Abstract: In order to solve the problem of serious fracture and water-carrying sand in the auxiliary inclined shaft of the Zhuanlongwan coal mine, based on the analysis of the current situation and potential threats of the auxiliary inclined shaft, and referring to the relevant treatment experience, this paper designed the treatment measures of "strengthening the bottom plate + strengthening the sand layer behind the wall by grouting".The grouting holes in the wellbore are arranged in a row, the main cement grout is injected, the pressure is strictly controlled during the grouting process, and the bottom plate is monitored at the same time. After the completion of auxiliary inclined shaft treatment, there is no water out in the treatment section. At present, the coal mining equipment on the two working surfaces has been safely passed, and no water out or floor fracture has occurred, indicating that the treatment effect is good.