Due to the fragile ecosystem and unique geographical environment on the TP,the vegetation strongly responds to climatic shifts.Therefore,it is of great significance to discuss the spatiotemporal trend shift of vegetation,to evaluate the climate change of the plateau and to predict regional ecological development. Using the GIMMS NDVI3 g dataset from 1982 to 2012 to extract the NDVI information of the TP,as well as establishing seasonal trend model to classify research through the seasonal trend analysis and breakpoints detection method,reveals the spatiotemporal pattern of the trend shifts of plateau vegetation at both ends of the breakpoints combining the classification of land cover.The results shows that conclusions. (1)The seasonal trend model can effectively identify the breakpoints of vegetation time series,moreover the time span of the breakpoints were large and the spatial heterogeneity were strong.(2)The trend of vegetation degeneration in the western part of the Tibetan Plateau was small,vegetation degeneration in the south and northeast regions was obvious,and vegetation in the central and eastern regions has improved.58.93%of the vegetation status tends to be stable.The area where the vegetation status changes significantly accounts for about 32.3%of the entire plateau.(3)In the area where the vegetation status is generally or significantly changed,the vegetation improvement of monotonous trend and interruption trend were more than that of degradation,and the degenerative situation in the reverse trend were more than the improvement. Monotonous trend changed in 3.14% of the regions,58.36% of the regions occurred interruption trend changes,and 38.50% of regions occurred reverse trends.The time distribution of the monotonous trend and the interruption trend were more concentrated,while the reverse trend covered the entire time series.( 4)The vegetation improvement and degradation in different land cover types were various conditions. The type with the highest rate of improvement was desert(53.30%),and the type with the highest rate of degradation was sparse vegetation(60.14%).Overall,the vegetation in Tibetan plateau tends to be greening, but the spatial heterogeneity remains significant.