中文摘要：

循环经济体系是一个多尺度的等级结构。本文首先论述了循环经济的组织尺度，指出循环经济组织尺度是世界可持续发展历程在当前时间断面上的映射，现实中的“大中小循环”和“3＋1”模式是循环经济组织尺度在实践中的应用：接着，明晰了循环经济的地理尺度，指出就物质循环体系或工业共生体系的实现而言存在着一个最优的地理尺度．传统经济向循环经济体系的演进需要重新探讨地理尺度上的资源环境要素；最后指出，良好的循环经济体系的构建不仅需要两大尺度之间的配合，而且还需要跨尺度层面的沟通与协调。

英文摘要：

Being a muhi-scale hierarchical structure, circular economy＇s implementation not only requires integration of its organizational scale and geographical scale, but also requires communication across the scales. The organizational scale, with ＂macro-, meso- and micro-＂recycles＇ model in implementations, can be considered as the projection of sustainable development evolution on current temporal section. The geographical scale, with its importance to the realization of material recycling and industrial symbiosis systems, brings rethinking of resources and environmental issues on economic development. Finally, their policy implications are also described briefly