The regional integrated energy system (RIES) is an effective network with sufficient utilization of multi-energy. Its economic evaluation is important. Aiming at the incomplete economic assessment indexes of the RIES and the index weight aggregation influenced by subjective factors,the structure of the RIES is analyzed,and RIES economic evaluation index system is established. Then,an improved minimum cross-entropy which can reflect the internal relationship between subjective and objective weights is proposed to improve the rationality of index weight integration. The investment schemes for the RIES are sorted and the optimal one is selected by a multi-criteria evaluation ranking method of technique for order preference by similarity to ideal solution (TOPSIS) combined with rank-sum ratio (RSR). Finally,the economic benefit of different system composition schemes of an industrial park is evaluated as an example. The results show the practicability of the proposed method,which can provide the effective economic benefit evaluation for planning and renovation of RIES.