Abstract: For an energy park, adopting a scientific evaluation system and methods to conduct resource condition exploration, energy structure analysis, and project planning decision-making is an important prerequisite for the precise planning, scientific development, and rational utilization of the park’s integrated energy system. This should be based on the resource conditions and user demand potential of the energy park. This study constructs a chain-based multidimensional flexibility adaptation evaluation system based on the resource-project-demand chain. It uses a subjective and objective comprehensive evaluation model combined with case data for evaluative analysis of the chain-end flexibility, inter-link coupling coordination, and overall flexibility and adaptation degree of the system. Through a case study, it was demonstrated that the established indicator system and evaluation results can effectively examine the local to overall coordination and adaptability issues of the existing energy system in the park and are suitable for evaluating the flexibility and adaptability of the integrated energy system. The effectiveness in characterizing the flexibility capabilities of each element in the resource-project-demand chain is satisfactory.