Abstract: The stady is Jalaid Banner，Hinggan League and Hulun Buir city as study area, bases on the MODIS NDVI data and uses the dimidiate pixel model data of research area 2001 to 2016 by inverting,then , studies the whole trend of change and influencing factors.The results show that extremely low coverage and low coverage vegetation area is growing With an average annual growth rate of 12.29% and 3.13%, the middle coverage is from the area of growth to reduce with an average annual growth rate of -4.63% ,and the high coverage and high coverage of vegetation area have been reduced with an average annual growth rate of -5.99% and -4.8%.The degradation rate is high where the slope of terrain factor ≤5°.In general,meteorology, elevation and Slope direction factors determine the classification and intensity of vegetation,but relationship between man and land is complex in the study area,then grassland degradation is mainly concentrated in areas where population density and livestock density are concentrated.