Eco-industry is a kind of industrial form, which imitates the way of physical recycle in natural ecological process to perform industrial ecological system. It is the optimal economical form of environmental protection, ecological and economical efficiency. But because of the complexity of its own path and operational mode, there are many problems, which become the bottleneck of ESN. How to promote its flexibility is the premise of ESN. This paper tries to have an analysis of the flexibility from the perspective of economics and social science.