A cleaner production assessment index system for industrial park with 7 firstlevel indicators and 26 secondlevel indicators was developed on the basis of sustainable development theories, such as cleaner production, industrial ecology and circular economics, and through combining the existing index system, evaluation standards and relevant literature of the industrial park, statistical analysis of evaluation indicators frequency, filtering out key indicators, and supplements via expert consultation of relevant indicators. The weights of various indicators were determined through the analytic hierarchy process, and the index evaluation criteria were determined with reference to published related standards and research results. The index system was applied to evaluating the cleaner production level of Suzhou National Environmental Protection Hightech Industrial Park, the result was qualified and consistent with the actual situation. The results showed that the indicator system can reasonably reflect the level of cleaner production of an industrial park, judge whether it reached the criteria of a cleaner production park, and put forward cleaner production assessment priorities and improvement suggestions at the park level to further explore the potential of cleaner production in industrial park.