There are certain tendencies of the integration of international trade and investment rules in current FTAs. A large number of FTAs have thus become self-containing systems of rules for the integration of trade and investment rules. Commercial presence for trade in service is with the characteristics of service and investment. Therefore, it is not only regulated by the single trade rules or investment rules among some of FTAs, but also governed by trade and investment rules simultaneously among the other FTAs. The dual application of aforementioned two types of rules has pros and cons. There are treaty experiences to solve those problems. With the implementation of the Belt and Road Initiative, the cooperation of trade and investment between China and other countries or regions would be deepen. The protection of Chinese FTAs is significant for relevant cooperation about commercial presence. Therefore, China shall take advantage of dual application of commercial presence for trade in service, and absorb mature experience to improve the FTA rules concerning solutions of relevant problems.