In order to evaluate the benefit rationality of the natural gas distributed energy system in the process of promotion, the applicability evaluation model was studied. The applicability index system was built from system characteristics, economy, energy efficiency, environment and other aspects. Setpair analysis theory was used to build a comprehensive model for semantic classification evaluation grade. The analytic hierarchy process was applied to calculate the index weight. The final applicable level was determined by calculation and verified taking a hotel in Xi'an as the example. The results showed that the evaluation results were great reference. Economy and environment were the key factors affecting the applicability of the current system. Compared with the traditional energy supply method, the energy saving efficiency of the natural gas distributed energy system was 12.35%. The system saved energy significantly and gave full play to the advantages of stepped energy supply. The reduced annual operating cost was 5.086 1 million yuan and the simple payback period was 6.61 years. The promotion of natural gas distributed energy system obtained higher benefits in low gas price areas.