With 2001-2015 MODIS /EVI data collected from Geospatial Data Cloud,the vegetation types and their fractional coverage( VFC) in Inner Mongolia were mapped,and then their spatial-temporal patterns were further analyzed with Mann-Kendall,at last,the interaction mechanisms between vegetation,and their impact factors( climate change and Human activities) were discussed . The results showed that:( 1) in 2001-2010,the decrease of grassland area was closely related to the development of animal husbandry,while from 2011 to 2015,the change of vegetation area was positively affected by related human activities;( 2) the overall VFC in northeastern part was higher than that in western part of Inner Mongolia during the whole study years,specifically,the mean VFC of forests,grasslands,and desert are 0.85,0.61,and 0.23,respectively;( 3) 32.82% of Inner Mongolia area successfully improved its VFC,while the VFC of the left part was unchanged;( 4) the overall VFC showed an increase tendency during the study years,with a sudden change in the span between 2001 and 2010,which was closely related to precipitation,and a tiny increase in 2011-2015,due to national policies and related positive human activities.