| In recent years, with the rapid development of China's economy, so that gradually speed up the urbanization process, there has been high-density population, the excessive discharge of waste and less green area of urban environmental issues,and it has a great impact and destruction of the original biomes so that producing a crisis in urban living environment. Studies have shown that plant have a positive effect for the active urban heat island effecting and air pollution controlling. Relevant data show that a person can absorb about 0.75 kg of oxygen per day and breathe out carbon dioxide exhaled 0.90 kg per day , so in order to get fresh air, everyone need to 10-15 square meters of forest or 25 to 30 square meters of grass. In our country, to cities across the country, the per capita public green land is only 6.49 square meters, there are lots of cities whichgreening rate is less than thirty percent of all city. Saving in the construction and environment-friendly society and to promote low carbon living and protect the ecological environment , ecological compensation under the roof garden with intensive use of urban space and improve the urban ecological environment and thus improve the effect on energy efficiency and also have other unique advantages. Roof garden has great ecological value, social value and economic value.Overview of the article from the roof garden, roof garden, the development of domestic and international situation and China's roof garden of the existing problems as an entry point of the roof garden of the cooling effect and ecological effect of urban water environment, and presented its design ideas and methods, and then on Roof garden planting design theory discussed in detail, describes the design of ecological compensation under the roof garden blueprint. In short, under the ecological compensation for the design of the roof garden,we should make full use of existing conditions at home and abroad, the roof garden industry promotion, development process, through a comprehensive, in-depth investigations and studies, in particular, we should do more and more researches in enhancing the roof garden in the cool, energy saving, protection of the urban ecological environment ,so that driving the practical effect of the sustainable development of society,andwe will achieve real progress and innovation. |