The Tibetan Plateau is sensitive to global climate change due to its special geographical position and unique ecological environment.In order to research the climate impacts on vegetation phenology,this paper first extracted the vegetation phenology indices using MODIS-derived normalized difference vegetation index (NDVI)data from 2000 to 2010,and then analyzed the vegetation phenology changes and their correlations with temperature and precipitation.Our study indicates that the start of growing season began in the late April,and most regions focused on May to June.The end of the growing season occurred in mid-September,and most regions focused on October.Overall,the start of growing season was relatively late in the west than in the east.The start of growing season became earlier with higher temperature in winter (from December~February),and the winter temperature had a greater influence on start of growing season than that in spring.The increasing of summer temperature leads to the advanced recession of vegetation that caused earlier end of growing season.The increased temperature and precipitation in autumn contributed to the delayed end of growing season.%青藏高原的特殊地理位置及其特有的生态环境，决定了它对全球气候的变化有着重要的作用和影响。利用2000年～2010年 MODIS NDVI 时序数据提取青藏高原植被物候指标，分析植被物候变化趋势及其与气温、降水的关系。结果表明：①青藏高原大部分地区的返青开始时间集中在5月～6月份，从9月中旬开始结束生长，部分区域10月份生长季结束；②整个青藏高原地区从东到西，随着海拔升高生长季返青期逐渐推迟；③冬季气温（12月～2月）适当升高，使植被生长开始时间提前，且冬季气温对植被生长的影响要高于春季气温；夏季气温升高，使植被提前进入生长衰退期；秋季气温升高，降水增加使植被的枯黄期推迟。
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