The Comprehensive and Progressive Trans-Pacific Partnership (CPTPP) represents the highest standard of regional free trade agreements for trade liberalization in the 21st century.China joined CPTPP is very necessary, not only in terms of international and domestic development trend with our country reform and opening up policy and corresponds to the power's foreign strategy, and on the economic level can play to the promotion of China's economy and trade and investment benefit big boost, in more strongly promote the domestic legal rules and legal system level specifications to the highest international economic and trade rules,It will also play an important role in promoting China's participation in the reform and development of international economic and trade rules and governance system.It is a win-win choice for China to join the CPTPP, and it is also very feasible. It can be said that the time is right, not only the stable and good domestic political environment of China and the strong political will of China's top leaders to join the CPTPP provide a strong domestic political guarantee. In addition, China has made great achievements in regional free trade and domestic free trade zone construction in the past 40 years of reform and opening up, especially in the 20 years since China joined the WTO and in the past 10 years, which also laid a solid economic and institutional foundation for China to join the CPTPP. China should strengthen relevant research, start accession negotiations in a timely manner, and make good preparations for accession by vigorously promoting reform and opening up and constantly improving relevant laws and regulations.