Based on the rationale of empirical research, there are major divergences in applying CISG in 4 FTZs. All the different applicable situations exist, which causes the disunity of applicable laws as well as creating an unfriendly international commercial environment. The reasons of divergences of applying CISG are the inadequate understanding of the rule in applying CISG, the lack of a domestic law and the unfamiliarity to CISG itself. In order to enhance the capability of court in FTZs applying international treaties and creating good examples for other courts, the Supreme Court should provide either judicial interpretations or ruling cases to require and guide the courts in FTZs to apply CISG accurately and in a uniform manner. In addition, devoting more efforts in cultivating legal professionals who are equipped with international trading rules is the basic requirement of applying CISG more accurately.