With the development of urban construction and people's living standards improve, people more and more attention to high - quality of living space, on the urban environment and landscape also continues to improve, eager to have a healthy living environment. Green and sunshine, air tied for urban residential area of three indispensable elements, the impact on the city's ecological environment is very large, urban development must ensure that a certain proportion of green space can play a role in improving the urban environment, the urban environmental quality is declining, which seriously affect the city's ecological environment. A city's image and style, including the city's ecological environment, especially the city's landscape level, the level of urban greening and the extent of the city's Wen Mingcheng, the level of modernization, economic strength, ecological environment, etc..
In today's urban construction, high-rise buildings, hardening area increases, many roads and pavement replaced the natural land and seedlings and limited urban green space is often occupied, urban residents have public green area is getting less and less, for greening land are often located in the corner of the building, seize every opportunity to green far can not meet the needs of urban residents. Urban green area must be continuously increased, can keep up with the pace of urban construction and expansion, to meet the needs of urban residents. Because of the construction of the horizontal direction of the green space is more difficult, we must put more green space to the construction space, to increase the size of urban green space, so the city in the construction of roof greening and vertical greening to increase urban green area, which is the development of modern architecture and landscape. In which the building roof space to carry on the multi - position, multi - level, multi - level, multi - function of the green, with the nature, the performance of nature as the keynote, the construction of green ecological building, in line with people's psychological pursuit, become the future city construction and housing construction.