Grassland is a basic resource for human survival that provides basic material for husbandry development and protection for land ecosystems. With global climate change and intensification of human activity,grassland degradation in China is a major issue. Policy interventions have been the main measure to control restrain grassland degradation and protect and regain grassland resources. With implementation of ecological management and ecological compensation policies,the process of grassland degradation has slowed,however,the contradiction between grassland production and ecological function has not been solved. Here,we selected Hulunbuir(a typical steppe in China)and used field surveys and remote sensing image data to analyze spatiotemporal differentiation of grassland changes between 2000 and 2015. Our aim was to evaluate the defects of national grassland policy on eco- animal husbandry. We found that the grassland quality comprehensive index decreased in area,accounting for 60.03% and 24.9% of the total area in the two periods and indicating a slight decrease. The change in grassland showed a clustered character. We found that the low value clustered region of grassland change is located in the farming areas east of Khingan,and high value clustered region of grassland change is located in the west typical steppe. Through investigating grassland policies we found that relevant policies such as enclosure and grazing prohibition,livestock balance and husbandry subsidies to grassland change has certainly played a positive role;however,they are alone not enough to prevent grassland degradation. Due to lack of policy and operational mechanisms,the effect of policies are lagging and there is further scope for significant effects.