以永州地区为研究区域，利用NASA提供的MOD13Q1-NDVI数据(2000 — 2014年)研究其植被变化特征。结果表明，永州地区植被指数处在0.6~0.8段的受外部条件的影响较小，而植被指数在0.8~1.0段的受外部条件的影响较大。植被指数在0.4~0.6段的走势与0.8~1.0段的大多数年份相反，植被指数在0.2~0.4和0~0.2两段所占比重一直处于一个比较低的水平。总体来说，永州地区的植被指数历年一直比较高，历年平均值为0.701。

Taking Yongzhou area as the study region， the changes of vegetation characteristics were studied based on MOD13Q1-NDVI data provided by NASA(2000 — 2014) . The results showed that the vegetation index in 0.6~0.8 of Yongzhou area was less influenced by external conditions， and the vegetation index in 0.8~1.0 was more influenced by external conditions . In most years the trend of vegetation index in 0.4~0.6 was contrary to that of 0.8~1.0. The proportion of vegetation index in 0.2~0.4 and 0~0.2 were at a low level. In general， the vegetation index of Yongzhou area has been always relatively high over the years， and the average value was 0.701.

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