The eco industrial park is the third generation industrial park in China following the economic and Technological Development Zone and the high and new technology development zone. The biggest difference between it and the first two generations is that under the guidance of the theory of eco industry, we should focus on the construction of ecological chain and ecological network in the park, maximize the utilization rate of resources, minimize pollutant emissions from industrial sources, and achieve regional cleaner production. Different from the traditional "design, production, use and abandonment" mode of production, the eco industrial park follows the recycling economy mode of "recycle, reuse, design and production". It mimic the way of material circulation in natural ecosystem, and form the symbiosis combination of shared resources and exchange by-products between different enterprises, making the waste generated in the upstream production process become the raw material for downstream production, and achieve the optimal allocation of resources between them.