Abstract: With the spring tide of world multipolarization, economic globalization and social informatization, the value and risk of the cross- border data flow is becoming more and more prominent. The risks that arise from technical loopholes, deficiencies in management, and imperfections in policies and regulations permeate the whole life cycle of data. It has become an urgent problem to be solved to further promote data governance and escort digital economy. Large amounts of cross- border data are difficult to sort and classify, and improper application leads to hidden risks. Crossborder data attack escalation, black ash production aggravates the data risk. Countries attach great importance to the regulation of cross- border data flow and the competition is warming up. Therefore, we have to co- ordinate the two overall interests of“inside”and“outside”, the two directions of“out”and“in”of data, and the two aspects of“development” and“security”and do a better job in data security and cross-border data flow management in terms of laws and regulations, responsibility system and security.

Key words: cross-border data , data flow, data security