Vegetation degradation is a significant factor in ecological degradation,which directly affects terrestrial ecosystems and climate change.Analyzing the character of vegetation degradation is of importance for ecological management and protection.In this paper,Mann-Kendall test was used for discussing the trends of vegetation degradation and degraded factor from 2000 to 2011 island-shaped permafrost(ISP)zone in the high-latitude.The results showed that the area of degraded vegetation accounted for 15.05% of the total area,of which 1.42% was seriously degraded and 13.63% was slightly degraded.Vegetation degradation region was mainly in the both sides of highway from Heihe to Bei'an,peripheral region of the northeast of the Dahekou woodland and the surroundings of floodplain marshes.Precipitation was positively correlated with vegetation index(P<0.05)and atmospheric temperature(P>0.05),indicating that the precipitation was the dominant factor of vegetation growth.With the degradation of ISP,there existed a ground water seepage phenomenon,and the normalized vegetation index dropped 0.26.The mutation point occurred in the Mann-Kendall trend curve in 2006.Meanwhile,permafrost degradation along with the soil temperature gradient had significant changes,and plant water conductivity becaome fragile,which inhibited vegetation growth.The results would provide spatial data support for the stable development of the ecosystem of alpine region and the exploration of hydrothermal condition variation.