Abstract: In view of the serious deformation of the easily weathered surrounding rock roadway, the traditional shotcrete technology has the problems of large pollution and slow construction speed. Based on the background of the north lane of rowing machine in Liupan District of Changping Mine, the lithology of the roadway roof is analyzed, and puts forward the sealing technology of thin layer rapid spraying.The results show that there are a lot of kaolinite, siderite and muscovite in the sandy mudstone layer of roadway roof, which is easy to expand and break when encountering water.The results of numerical simulation and field test show that the effect of thin-layer rapid spraying is good. After spraying, the deformation of roadway, the separation of roof layer and the stress of support body are obviously reduced. The amount of construction rebound is small and there is no dust. The spray footage of a single shift can reach 8-10 m, and the optimal thickness of spraying is 8 mm or 10 mm. When the spraying thickness is 15mm, the wire mesh can be used to replace the steel mesh for roadway support.