Abstract: By means of replacing space with time, the effect of eco-restoration around Lapahai Lake in Shangrila County was monitored and assessed by observing the watershed area, investigating into plant community structure, and by testing the chemical and physical properties of the local soils.It was showed that the functions of the degenerated land eco-systems in the southeastern marginal area of the Tibet Plateau might be improved in a short period of time through natural and man-induced restoration.It was proven by the succession tendency of the vegetation community structure that the eco-function of the natural secondary forest was the best, followed by artificial mixed forest and the wild grassland.It was showed that the shrub eco-system had the best improving effect on physical and chemical characteristics of the soil, while the natural secondary forest and shrub vegetation had good effect on water and soil conservation. Farmland was the most fragile eco-system with worst degradation.