The railway protection net is used to protect the slope and prevent rock falling, which is divided into active protection net and passive protection net: the active protection Active protection system is a flexible net covering and wrapping the required protection slope or rock, mainly with wire rope net, to limit the weathering, peeling or destruction of rock and soil mass on the slope surface, as well as rock collapse (reinforcement), or to control the movement of rock falling within a certain range (enclosure). Passive protection is composed of four main parts: a wire rope net, a circular net, an additional layer of iron wire grille when intercepting small falling rocks, a fixing system (anchor rod, anchor rope, base and support rope), a pressure reducing ring, and a steel column. The connection and combination of steel column and wire rope net form a whole to form a surface protection for the protected area, so as to prevent the falling of collapsed rock and soil mass and play the role of slope protection.