Abstract: With the global energy and environmental problems becoming increasingly prominent，the regional

integrated energy system（RIES）with multi-energy complementary characteristics is an effective solution. In order

to realize the comprehensive and reasonable evaluation of energy efficiency of the RIES，a detailed evaluation index system from the aspects of energy supply efficiency，energy conversion efficiency，energy supply reliability，energy supply quality，economic and social benefits was established. And on the basis of AHP entropy weight method，the calculation method of combination weight was given. Then，a regional integrated energy system energy efficiency evaluation method based on improved TOPSIS was proposed to evaluate different planning schemes more intuitively and clearly. Finally，the rationality and effectiveness of the proposed method were verified by an example of a RIES.

      Key words: integrated energy system（IES）；energy efficiency assessment；multi-dimensional index system；

technique for order preference by similarity to an ideal solution