Abstract:

The article introduces the advantage of making green roofs. It analyzes the development of Germany's green roofs from five aspects, including the types, course and situation, policy and criterion, technology and market foreground. It also generalizes the course and situation of our country and points out some issues of making green roofs in Beijing, such as the distemperedness of market, concept confusion, high cost, limited plants resource, construction and technology problems, lack of professionals and so on. And it aslo indicated that the bottle-neck of the development of green roofs in Beijing are three aspects including the selection of suitable plants, the low load of roof tops and contravention of using water. Then it put forward that developing green roofs in china must resolve three questions: the government's guidance and technical assistance as well as spread conception.

Key words: roof greening, development situation, Germany, Beijing