Abstract: To solve the problem of slippy spalling in the 9# pedestrian roadway of Aiweiergou Coal Mine with large dip coal seams, a comprehensive application of geological condition investigation, theoretical analysis, numerical calculation, physicochemical analysis, on-site testing and other means and methods are used to study the mechanism and countermeasures of slippy spalling mechanism of roadway. The results show that under the influence of fissure water, the roof rock layer of 9# pedestrian roadway undergoes severe argillization and sliding along the dip of coal seam, causing the high wall coal body in the roadway to lose the constraint of the roof and forming a triangular plastic zone with a depth of about 8 meters in the middle and upper parts, resulting in the sliding slope of the coal body and causing the overall instability of the roadway. The key to control the sliding slope of 9# pedestrian roadway is “strong roof support” and asymmetric support. Based on this, a surrounding rock control plan of “roof grouting anchor rod（cable）+roadway side anchor cable truss beam combination support” for 9# pedestrian roadway is proposed, and the on-site practice results are good.