Aiming the issue of adaptability and response to climate in southwest China,in this study,NDVI data during 1999 ~2012 and the data of temperature and precipitation in the same period was used to study response mode of main types of vegetation to climate changes.GIS and RS technologies were applied by method of maximum value composites and slope method to analyze spatial changes of vegetation cover in this area in recent 14 years and its correlation with temperature and precipitation.The results show:1)In recent 14 a,vegetation coverage of all seasons in this area presented an decreasing trend. Meanwhile,the increasing rate of vegetation coverage in spring was the most obvious(8.7%/10 a.P<0.001)and followed by autumn,while the rate in summer was the slowest.2)This region was characterized by its growth season bringing forward. Temperature was the main natural factor that could influence the growth season,and the increase of precipitation led to increase of growth season amplitude.Growth season bringing forward was the main characteristic of all vegetation types except for agricultural-forest vegetation that was characterized by growth season extension.3)The vegetation coverage mainly occurred in spring with the largest part in the study area(47.39%).The results exhibited that growth season been ahead of time was the major response of vegetation to climate changes in recent 14 a,however,there is a significant spatial difference as seasonal response.Growth season of vegetation in the Zoige Plateau,Sichuan Basin,western part of Yunnan-Guizhou Plateau as well as most part of the Guangxi Hills displayed a trend of ahead of time;growth season of vegetation in the Sichuan Basin,central part of Guangxi Hills,central and eastern part of Yunnan-Guizhou Plateau appeared a trend of extension.