Vegetation coverage is an important indicator of regional ecological environmental change.Climate change and human activities are the factors affecting vegetation coverage change.Several ecological construction policies were implemented in Hangjin Banner after 2001.Based on the Dimidiate Pixel Model and Landsat5-TM remote sensing data(1991,2001,and 2011),a comparative analysis was conducted of the change in vegetation coverage from the period before the implementation of the ecological policy(1991to 2001)and that post-implementation(2001to 2011).The factors affecting vegetation coverage change were explored in conjunction with climate change and ecological construction processes in the study area.The results showed that after the implementation of the ecological policy,the vegetation coverage in the Hangjin Banner increased significantly,and the average annual growth rate of vegetation coverage was approximately 10times that of the pre-implementation period.Vegetation coverage improved significantly,and the net improvement area accounted for 18.83%of the total area.Ecological policy was the main driving factor of the increase in vegetation coverage during the period 2001-2011.The influence of precipitation and temperature on vegetation coverage was not significant.