关键词: 跨境数据流动, 综述, 欧盟数据, 数据保护, 国家政策

Abstract: With the advent of the era of big data, the process of globalization is accelerated, the economic and political exchanges between countries become more frequent, the competition for data becomes more and more fierce, and the cross-border flow of data is inevitable. Although the European Union, the United States and other major international economies give priority to the deployment of cross-border data, which provides effective reference for different countries, with the increasingly urgent demand for cross-border data flow, the related issues of national security and personal data protection are gradually highlighted. First, by combing existing research works on cross-border data flow, starting from the concept of data cross-border, we summarize their advantages and disadvantages; then, starting from the core data security technology and regulatory mechanism, we systematically analyze and compare cross-border data current situation of the flow of multiple countries ; finally, based on the collation and summary of existing works, we discuss the shortcomings and challenges of China's existing data cross-border management system, put forward targeted suggestions and solutions, and look forward to the research and development trends in this field. 

Key words: cross border data flow, overview, EU data,;data protection, national policy