Carbon sink becomes a scarce resource and causes a high attention by the signing of Kyoto Protocol.Forward-looking countries and regions should be aware of the prospects for the development of carbon sink industry.In this paper we defined the concept of carbon sink industry,and used essence theory of forests,carbon density method,Li and T.O.West methods to estimate Inner Mongolia's forest,grassland,farmland carbon sinks resources.In 2003 there were 17.2×108 tons of carbon,and in 2009 were 18.1×108.The potential for industrial development of Carbon sink in Inner Mongolia was analysed and the specific strategies and recommendations were proposed.