Maximization of efficiency and benefit in resource use is required by circular economy,which is the important to construct a resource-saving and environment friendly society and realize sustainable development.The assessment of regional circular economy and its indicator system must follow this basic principle.All of the economic activities should be guided by ecological principle and standardized by ecological efficiency.The leading method of material flow analysis(MFA) provides a methodologically effective decision support tool to resource,waste and environmental management as well as a new research approach for regional circular economy assessment.Based on expounding MFA and its indicators and the "3R"(reduce,reuse and recycle) principle,analytic hierarchy process(AHP) and net-hierarchy theory were used to construct the assessment index system,weights system and the assessment index grading standards of regional circular economy,which are suitable for the local ecological economic system.Wujin District of Changzhou city located in Yangtze River Delta was selected as study area draft the regional circular economic judgment model.The status of Wujin regional circular economy was analyzed and evaluated based on a series of analysis.The results show that:1) the assessment index system,weights system and index grading standards of regional circular economy established herein are suitable this study area and the evaluation models are useful to assess the circular economy in related regions;2) The comprehensive index of circular economy in Wujin District in 2004 is in grade IV,that is,in the non-circular state,and the three sub-indicators are ranked as: resource reuse harmlessness reduction;3) Based on the assessment results of all indexes,the resource productivity,intensity of wastes discharge,reuse rate of industrial water,reuse rate of municipal grey water,treating rate of hazard wastes and treating rate of household wastewater are the weak points of all indexes.In this paper,the problems existing in the assessment indicator system of circular economy were analyzed,the development of regional circular economy was prospected,and a new study approach for regional circular economy and sustainable development was provided.