This paper explores Japan's successful experience in controlling SetoNaikai and discusses the enlightenment to China's governance of Bohai Sea. In 2006, the National Development and Reform Commission launched the “Bohai Sea Environmental Protection General Plan" and also announced the failure to implement the “Bohai Sea Clean Sea Action Plan" in the past five years. Similarly, there has been similar pollution in SetoNaikai of Japan. But after 10 years of treatment, it has been quite effective. Through the research methods of international cooperation and exchange, expert interviews and literature analysis, the current situation and existing problems of governance of Bohai Sea are mastered. This paper selects SetoNaikai as the research object, compares the environment and policies between China and Japan and constructs countermeasures and mechanisms of China's environmental governance of Bohai Sea