Abstract: Based on the imagery interpretation of Landsat4/5 TM in 2000, 2005 and 2010. Using ArcGISsoftware, I made the vegetation distribution of Hulunbuir grassland and quantitatively analyzed the influence of open cut mining to the Hulunbuir grassland: ① The Hulunbuir grassland vegetation intensity change retarded. The overall scale approached equilibrium and major concentrated in the grassland turning into construction lands and unused lands. The ratio of the reducing grassland is 0.38%. ② The open cut mining increase the grassland reducing area. The ratio of the reducing grassland is 3.09%. Vegetation change dramatically. ③ In the area of the open cut mining, the changes of the arable land, forest land, wetland and water are relatively stable. The increasing of the construction lands and unused lands are mainly from the reducing grassland.