The impact of global climate change and human activities on grassland ecosystems has been increasing in recent years. The sensitivity of alpine grassland ecosystems to global changes has attracted the attention of many scholars. Forage height, coverage and yield are important basis for determining the growth of grasses. Grassland biomass, as an important indicator of grassland productivity, is of great significance for studying changes in grassland vegetation, evaluating the growth of grassland, and providing reference for grassland management. Coverage, as one of the important parameters of grassland community structure, can reflect the health status of grasslands. Plant phenology is an important indicator of environmental change, and in alpine meadow ecosystems, which is more sensitive to climate change. At the same time, precipitation and temperature, as important climatic factors, have become the focus of research on factors affecting the growth of grasslands. Alpine meadow is one of the most sensitive alpine grassland type in response to climate change. Studying the response of changes in plant growth characteristics of alpine meadow to the meteorological factors is important for analyzing the effects of climate change on alpine meadow. Therefore, in order to make rational use of alpine meadow resources and explore the impact of climate change on alpine meadow in recent years, this paper takes alpine meadow in Gande County, Qinghai Province, as an example. We analyze the community characteristics such as above-ground biomass, height, coverage and phenological stage of meadow vegetation based on the pasture observation data from 1994-2006, as well as local air temperature, rainfall and other meteorological data from 1976-2006. The results showed that (1) the alpine meadow on the Qinghai-Tibet Plateau was warming and drying with averagely annual temperature and average ground temperature rising and annual precipitation falling. The coverage and height of forage were increasing, while the yield is decreasing, and the forage phenology was delayed at the overall observed level. (2) Forage height, coverage, and yield responded differently to different climatic factors. Forage height and coverage were more sensitive to changes in temperature, and forage yield was more sensitive to changes in moisture. The higher the average ground temperature and relative humidity, the higher the height and yield of forage. (3) The trend of phenology is influenced by different meteorological factors. On the whole, the phenological phase of forage is more sensitive to the temperature factor, and the higher the temperature, the earlier the phenological phase.