Vegetation is very important by carbon-cycle on global land. And climat–change affects the growth and photosynthesis of vegetation. The change of vegetal index can reveal the evolvement of environment.Long-term quantitative analysis of vegetal distribution and change will tell us the reason of environment change. This paper discusses and analyses the change of vegetal cover and its response to climate-change by means of“3S”technique and statistics based on ecology and environment science .Here is th...