Mine spraying is a new technology suitable for greening of geotechnical slopes and rocky slopes with high degree of weathering. It uses a special jet machine to spray organic substrates such as grass seeds and water retention agents onto the slope, and the organic materials are closely combined with the slope under the action of pressure to form a matrix layer for plant growth and development. The requirements for soil thickness for spraying, depending on the specific situation of the slope, are usually 10-30cm.