Based on MODIS NDVI data and meteorological data during 20002010,spatial and temporal distribution of NDVI and its relationship with regional climate in wood-grass ecotone of Northeast China were analyzed.The ecotone was composed of typical grass zone,wood zone and wood-grass zone.The results showed that:(1)Monthly average variation of NDVI had a single peak,quaternary variation of NDVI had the highest value in summer;NDVI went up with fluctuation from 2000 to 2010;(2)There were significant spatial differences in vegetation NDVI,which generally decreased from east to west;the wood zone had the highest NDVI and the grass zone had the fastest increasing rate;(3)The inter-annual changes for the selected ecotone as a whole,the typical zone,the wood zone and the wood-grass zone were respectively correlated to precipitation,temperature,precipitation and temperature;(4)Within a year,NDVI had a significantly linear correlation with precipitation and exponential correlation with temperature;Both precipitation and temperature had time lag effects on NDVI during the growing season,with greater effects of precipitation than that of temperature;forest-grass zone had a lagging response to precipitation.