Abstract: With carbon-oxygen balance theory, ecological land demand with carbon-oxygen balance standards can be estimated by comparing the carbon release and oxygen consumption induced by human activities and carbon sequestration and oxygen release capacity of ecological land.This paper takes Wuhan as an example, land use comprehensive benefits optimal objective function is set up following the two-oriented society construction principles as "environmentally friendly, resource conservation," with 2013 as the base year and 2020 as the target year, the direction of land use structure optimization under carbon - oxygen balance constraints in Wuhan is explored.The results indicate that compared with 2013, the standard ecological land in 2020 will increase by 40908 hectares after optimization of land use structure, there will generate overall efficiency of 43.1 billion yuan carbon sequestration capacity and oxygen release capacity will reach 5.32 million tons and 14.18 million tons, accounting for 43.25% of carbon release and 30.29% of oxygen consumption respectivelycarbon sequestration task can be completed and there is a surplus, but oxygen balance can't be achieved within the region.It will be difficult to maintain carbon and oxygen balance only by increasing the ecological land, so development patterns must be transformed to hold the balance in the long term.

Key words: ecological land, carbon-oxygen balance, land use structure optimization, Wuhan