This study was examined the planting forms and the actual condition of use on the roof-top buildings which was covered with greenery space more than 100 m2, extracting from the questionnaire that was intended for building owners. As a result, about a half of the buildings were opened and able to use, and private facilities have much higher rate of open facilities than public, but open areas were occupied about 80 % by the public. It was supposed that the green area needs on planning and designing more than 1,000 m2 in order to open the roof-top greening facilities to the public. As a main use form, the garden use was the most many in both public and private, occupying about 50%. The rate of planting tall trees and medium-height trees showed much higher in private facilities than in public, and the construction cost and maintenance cost were showed similar tendency, it was suggested that the level of construction and maintenance of the rooftop-greening showed marked differences between both facilities.
