The theory of circulating economy,propounded as a kind of economic development model,would be an inevitable option for man.The core concern of circulating economy is environment and natural resources.Its essence consists in a process of economic activity but not in an economic factor; and its chief characteristic is an emphasis on frugal and prudent use of natural resources and protection of ecological environment.As a kind of theoretical formulation,the theory is a derivative from the proposition that advocates sustainable development.