There’s a multi-dimensional，deep and wide-ranging background for the establishment of Qianhai’s personal data protection system，which can be concluded from four perspectives：the economic context，the political context，the social context and the legal context. The main legal basis of Qianhai’s personal data protection system is the Personal Information Protection Act and the Data Regulations of Shenzhen Special Economic Zone，which specify the legal obligations of data handlers when they are handling personal data in detail，laying a solid foundation for the system’s innovative practice. Qianhai has carried out different degrees of innovative practice on personal data protection in the legislative，administrative and judicial fields，and has achieved good results. In the future，Qianhai can also explore the three aspects of data compliance review，data classification management and personal data cross-border transmission，so as to provide richer practical experience for data cross-border and interconnection among the three places in the Guangdong-Hong Kong-Macao Greater Bay Area.