Starting from the external circulation and internal circulation, this paper discusses the current situation, problems and countermeasures of each element of dual circulation. Although the Guangdong-Hong Kong-Macao Greater Bay Area has advantages in many aspects, there are still some problems, such as the relative unification of import and export direction, the relative concentration of product types, the imperfect supply chain, etc. In view of these problems, the paper puts forward the economic and legal measures to solve and improve, for the smooth operation of the dual circulation, security and stability to provide the basic security.