This project total evaluates the No.6 Naphtha Cracking Project from four sides, including economy, environment, social culture, and health. The project completed the baseline data, 9 site investigations, long-term trends statistics and analysis, EIA commitment review and comparison. Besides, the lack of survey data, such as fishery resources and social culture side, conducted the questionnaire and interview investigations to assist the evaluation. The project held 14 group meetings, 7 cross-group meetings, 2 consultant meetings and 2 symposiums with Yunlin County government and local environmental groups. The No.6 Naphtha Cracking Project Total Evaluation Conference was held 3 days, about 600 participants on October 27 to 29, 2010. Through the evaluation, the project integrated the information of the No.6 Naphtha Cracking Project, analyzed the long-term trends, summarized the evaluation of management needs of similar large development projects, and provided the suggestions for supervision management EIA system in future.