Research conclusions: The main causes for the landslide are decrease of the antiskid capacity of slides zone under the action of water, manual excavation of the tunnel open or blasting. The landslide can be controlled effectively by taking relative measures, such as surface drainage, jetting concrete, construction of gravity retaining wall before the tunnel excavation, adopting pipe-shed grouting in advance, steel structure, grouting anchored bar, consolidation grouting and lining.