| Sustainable development is an inevitable way for human society's development, and industrialization is a stage we can't go beyond, then how to realize the sustainable development of industry has become the focus of the whole nation and even the whole world. Eco-industry, based on ecology and eco-economics, is a new mode for industrial sustainable development. Based on the summary of the basic theory and practice of eco-industry home and abroad, this article analyze the development of eco-industry which is the industrial idea in 21st in China. With the planning of the eco-environmental sustainable development for Longgang district of Shenzhen city as the example, a influence factors system about eco-industry development is discussed in the article. The conclusions are as follow:(l)The main idea of eco-industry is to regard industrial system as a specific kind of eco-system, which is the specific distribution of substance, energy and information flowing. Good effect has been attained in the practice of eco-industry. Because it is a great breakthrough of the traditional industrial development, the mode of eco-industrial sustainable development in our country is inevitable imperfect. Some deficiency has appeared during the development of our country's eco-industry, such as imperfection of relevant policy, shortage of practical experience and technical support during the scientific construction of eco-industrial system.(2) In this paper, three layers of hierarchy -target layer, rule layer and factor layer-were established in the influence factors system of eco-industry development. Target layer is the overall influence to eco-industry. Rule layer is composed of seven parts, that is social economic development, the emission of industrial waste and the control of gross contamination, industrial pollutant control and waste resourcization, eco-industrial system, environmental management in industrial firms, ecological construction, resource and energy consuming.(3) Qualitative and quantitative analysis are associated to establish the weight system that influence eco-industrial development. The weight distribution of every layer, which is determined by Analytic Hierarchy Process (AHP), sufficiently embodies the major idea of eco-industrial development, gives prominence to the emphases of eco-industrial development, and defines the directions and emphases of eco-industrial practice.(4) Based on the system this article has established, we select two groups from twenty-four factors' data related to contaminant emission and control which for sixteen types of industry in Longgang district, and analyze them by fuzzy cluster analysis. The result shows that more attention to the control, overall planning and enhance technique level for main industry is a key to develop eco-industry. The result is practically significant for the implement of the planning of the eco-environmental sustainable development about Longgang district.
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