The grouting material shall be cement slurry or cement mortar with strength grade no less than M10, and water reducing agent shall be added. The grouting cement shall be Portland cement with strength no less than p42.5. The grouting method can be gravity non pressure, low pressure and high pressure. When the soil quality is poor or the inclination level of soil nail is small, low pressure grouting and high pressure grouting can be used, and exhaust pipe shall be equipped.