Abstract: 【Objective】 In order to provide theoretical basis for the restoration and scientific management of degraded meadows, the response rules of vegetation community characteristics and nutrient content to no-grazing and grazing in Xinjiang mountain meadows are clarified, and the dynamic change rules of vegetation community in different growing seasons are explored. 【Methods】 In this study, the no-grazing (5 a) and grazing mountain meadows grassland in Xinjiang was taken as the object. The species composition, quantitative characteristics, community diversity and forage nutrients of the grassland community during the whole growing season (from May to August) were determined and analyzed by field sampling and indoor analysis. 【Results】 (1) Under the conditions of no-grazing and grazing, gramineae played an important role in the mountain meadows grassland, accounting for 46.48% and 26.91%, respectively; While the proportion of degraded indicator plants (such as Geranium pratense, Phlomis pratensis and Iris ruthenicum) increased in the grazing area. But no-grazing reduced community diversity. (2) The response of plant community quantity to no-grazing and grazing was obvious. The vegetation density, height, coverage, aboveground biomass (from July to August) and belowground biomass (0-10 cm) in the no-grazing were all higher than those in the grazing area. (3) Compared with the no-grazing area, the content of plant fiber in the grazing area significantly decreased by 18.95% in the early part of the growing season (May), while the content of grass crude protein significantly increased by 8.37% in the middle part of the growing season (June). 【Conclusion】 No-grazing can improve the quantity of grassland, increase the proportion of high-quality pasture, and effectively restore degraded meadow grassland, but it is not conducive to the maintenance of community diversity, while moderate grazing in the early growing season is conducive to the improvement of community forage quality. Therefore, it is necessary to combine no-grazing and grazing in the utilization of this kind of meadow grassland, which has a positive effect on the sustainable development of grassland.