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The rapid industrialization and urbanization have brought about serious ecological problems in Seoul such as pollution of the environment, destruction of the ecosystem, changes of urban climate, urban water cycle and so on.Seoul is a metropolitan city with a population over 10 million and a per capita green area of 16.6m2.Although this appears to be larger than the FAO recommendation of 9.0m2, it is reduced to 5.2m2 within built up areas, because 75% of the green space is located in the outskirts of Seoul.Thus, the green space is quite insufficient in the downtown area in Seoul, in addition to being beset with other perplexing difficulties.Green roofs have attracted much attention nowadays as an alternative for solving ecological problems.The expansion of green roofs of Seoul is based on the Building Law and "Biotope Area Factor".Since 2002, the Seoul Metropolitan Government has organized a support project of creating green roofs.Hereafter, the green roof support policy is meant to be expanded in scale.In this way, the Seoul Metropolitan Government is planning to make 600 roofs green by 2012.Recently, the Seoul metropolitan Government and the committee of Seoul Green Citizens have been trying to promote the project being called "The creation of a hundred thousand green roofs" for revitalization of green roofs.Reflecting this policy, many large green roof projects are emerging for new buildings.Those will be used as green roof parks with consulting before planning of large construction project with the Seoul Metropolitan Government.Such a green roof policy, support program and consultation may contribute greatly to the expansion of green roofs in Seoul and thus the improvement of ecological functions in cities and the climate change mitigation.