Regional integrated energy system(RIES)provides a platform for coupling utilization of multi-energy and makes various energy demands from clients possible. This paper starts with the analysis on the structure and advantages of RIES. When considering the coupling relationship between inner the power supplies within RIES

the situation how energy transforms

flows

distributes

and stores in the diverse processes is systematically described. The comprehensive evaluation index for RIES is constructed by extracting the general adaptive indicators from energy supply link

device link

power distribution link and the customer link. The evaluation index is designed based on taking the distribution system as a core and the multi-energy system coupling of distributed energy sources

natural gas

geothermal heat and public transportation. The analytic network process(ANP)of anti-entropy method is used to determine the index weight and the scoring function to solve the problem of the crossover and mutual influence between the indices caused by the inaccurate of weights calculation. The method can accurately assess the developmental level of domestic regional energy system

and its validity is proved by practical example calculation. Finally

the beneficial suggestions for the development of RIES in China are offered.