With global warming, significant changes are taking place in phenology. Change of plant phenology is the most sensitive and easily observations gauge of plants to climate and environmental change. The affect of climate change on plant phenology and Its response research become one of the hot issues of global change. Traditional observation methods of phenology are the visual observation methods based on field observations, the development of remote sensing and other new technologies provides a new means for phenological monitoring and research. Normalized difference vegetation index (NDVI) is becoming important means of research responses of vegetation on climate. Based on MODIS16 day's synthesis of NDVI products, the author extracted dynamic curves of NDVI from 34 kinds of typical vegetation communities of our country, and then analyzed its ability to plant phenology monitoring. The results show that: 1) Characteristics of changes in NDVI of natural vegetation communities during the year were obvious, they could be divided into three types: the first kind of vegetation communities fluctuated larger; the second kind fluctuated little, but its changes during month were intense; the third kind was similar to the first type, but to be a lesser extent; 2) the dynamic curve of NDVI of typical vegetation communities conformed its actual growth.%随着全球气候变暖，物候正在发生显著变化。植物物候变化是植物对气候与环境变化最敏感且易观测的指示计，气候变化对植物物候的影响及其响应研究成为全球变化研究的热点问题之一。传统的物候观测方法是野外观测为基础的目视观测法，遥感等新技术的发展，为物候监测、研究提供了新的手段，归一化差值植被指数（NDVI）正日益成为植被对气候响应研究的重要手段。本文基于MODIS16天合成 NDVI产品，提取了全国34种典型植被群落的NDVI动态变化曲线，分析了其进行植物物候监测的能力。研究结果表明：1）自然植被群落的NDVI年内变化特征明显，大致可分为三种类型：第一种植被群落的年内NDVI波动较大，第二种植被群落的年内NDVI波动不大，但月内变化较为剧烈，第三种植被群落的年内NDVI变化曲线与第一种类型类似，但幅度较小；2）典型植被群落的NDVI动态变化曲线符合其实际生长情况。
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