Abstract: The recent global economy development had ignored the essential ecological principle.People have been turning the economic development from linear mode to circular economy for the needs of survival and development.Circular economy is the economy mode following ecological laws.The main part of circular economy in industry is the construction of ecological industry chain ,which is based on the imitation of the high efficient use of material and energy in natural ecological system.The flexibility of industry chain is very important,which can be illustrated by some elementary ecological industry chain from field servey.The importance of flexibility in terms of risk was dissussed, such as the management risk,maintenance risk and contingent risk. Illustration of flexibility is of great importance for the industry chain to recover from the risk.

Key words: Spermatophyte, Floristic element, Areal-type, Hunshandake sand, Inner Mongolia