Abstract:The ecological security barrier system is a composite system to maintain ecological security and sustainable development within and outside the region. This system enables the maintenance of the structure and function of the ecosystem in the ecological security barrier region relatively shielded from or minimally impacted by external environmental threats, so that forms a multilevel and orderly stable pattern. Over the period from 2000 to 2020, the ecosystem water conservation function was on the rise, and the soil conservation function, net ecosystem productivity, and habitat quality were generally stable in the Qinghai-Xizang Plateau. Comparing the previous three national parks and four major types of ecological protection and restoration projects, it is proposed to build 13 national parks, about 200 nature reserves and about 250 nature parks on the Qinghai-Xizang Plateau by 2035. It is suggested a dynamic adjustment of the ecological protection red line and urban growth boundary according to the construction process of the system of natural protected areas. In the implementation areas of eight major ecological protection and restoration projects, the main position of ecological protection is highlighted, and natural restoration measures and local grassland restoration in some areas are important. The management of different natural protected areas and ecological protection and restoration projects should be place based, and optimizing the ecological security barrier of the Qinghai-Xizang Plateau by “working with nature” in accordance with the natural law of environmental changes.