Abstract: The measure of sustainable development of Suining national eco-demonstration area was studied.The results show that the ecological footprint per cap.was 1.517888hm²，the ecological carrying capacity was 1.286877hm² and the ecological deficit was 0.231011hm² in 2001，showing that the social economy of Suining County was not sustainable.But after eco-demonstration area construction，the ecological footprint will be 1.343577hm²，1.328835hm²，the ecological carrying capacity 1.320071 hm²，1.423893hm²；the ecological surplus -0.023506 hm²，0.095058 hm²；the ecological footprint per 10000 yuan GDP 2.46hm²，0.83 hm²；the ecological carrying ratio 0.98，1.07 in 2005 and 2015 respectively.The ecological deficit and ecological foot print per 10000 yuan GDP become decreasing，the ecological carrying ratio becomes increasing and reaches about 1 after eco-emonstration area construction，which makes resources utilization and energy constructure optimization，social economy becomes sustainable.