Abstract：An environmental performance management system for enterprises in eco-industrial parks was developed based on CCR model, a classical data envelopment analysis method, containing two important functions of performance evaluation and environmental regulation. And Nantong Pesticide Industrial Park was introduced as a case to apply and verify the system. The function of performance evaluation was used to evaluate 20 enterprises of similar type in the case. 7 enterprises achieved relatively high environmental performance. Results of environmental regulation function showed that the total environmental regulation of enterprises was highly correlated with the sorting of environmental performance. The system could provide quantitative suggestions on pollution abatement, and could be an effective management tool for development of the parks’ circular economy and construction of an eco-industrial park.