The cross-boundary flow of cloud data in generalities is the key of forming resource sharing and breaking the bottle neck of information industry development. Domain rules of flowed nations and regions have their own systems and international rules have many defects. They seriously hinder the orderly cross -boundary flow of cloud data. Taking the establishment of international standards of protecting cloud data, the foundation of intergovernmental regulatory organization of cross -boundary flow of cloud data and the enactment of international agreements of concrete cloud matters as the point of departure, we should reconstruct international rules system of cross-boundary flow of cloud data. We also should propel the overseas application of domestic rules on cross -boundary flow of cloud data by comprehensively applying subjective and objective principles of territorial jurisdiction and expansively applying personal jurisdiction rules.