Abstract: The highway slope protection has always been an important part of engineering construction practice. Traditional slope protection methods such as retaining wall, anchoring and shotcrete have induced many negative impacts on the ecological environment. The application of vegetation ecological slope protection not only achieves slope protection but also effectively protects the environment. With the harmonious development of the ecological environment and the human civilization, the application of the vegetation slope protection technology in the highway slope protection engineering will be more and more popular. However, the mechanical properties of vegetation roots and soil interactions are complex. The effect and stability of the slope protection needs further study. Therefore, this paper starts with the basic theories and analysis methods of the vegetation slope protection. The stability of the vegetation slope protection in the construction of highway slope project in Qinghai is analyzed with an aim pf providing reference for the safety and stability of similar engineering slopes.

Key words: slope, sliding surface, mechanical model, reinforcement effect, FLAC^3D, mechanical parameters