Abstract: “Mountain protection” is an ecological restoration strategy that aims to, based on the maximization of mountain protection and minimization of human intervention, accelerate the organic integration of damaged mountains and relevant biological and abiotic elements thereon, to form a stable mountain ecosystem and restore the ecological functions of such mountains, thus achieving the goal of “green mountain”. Taking mountain protection in Guangyang Island as an example, this research puts forward a mountain site condition classification system involving 4 categories, 8 sub-categories and 24 specific classes(abbreviated as “4824 system”), based on which determines the three strategies of protecting, recovering and getting in intimate touch with mountains,and summarizes the nine major mountain protection steps of site investigation, disaster prevention, facade soil consolidation, soil construction, vegetation reconstruction, nutrient self-sufficiency, water management, automatic monitoring, and scientific management and protection. After the implementation of the “mountain protection”project, the mountains in Guangyang Island have achieved better coordination with other elements in the life community therein such as rivers, forests, farmlands, lakes and grasslands, accompanied by the significant improvement of biodiversity, thus presenting the ecological landscape of “beautiful mountain shape, pleasant mountain scenery, natural mountain bones, healthy habitats, and diverse and fascinating historical sites”, and reproducing the authenticity and integrity of the mountain ecosystem.