I. Introduction
The trend of Economic Globalization has made the trade in global cross-border goods and services face unprecedented opportunities [1]. The development of Economic Globalization has also brought new demand for full-time and global service in cloud computing. This demand is explosive, global and diverse. It makes a huge gap between the traditional single cloud service provider's service capabilities and the resource needs [2], [3]. For example, the Electronic World Trade Platform (eWTP) proposed at G20 summit in 2016 aims at achieving cross-border e-commerce of “global buying and global selling”. But it is impossible to improve the user experience relying only on a single cloud service provider. To solve this problem, National University of Defense Technology (NUDT) has proposed the concept of JointCloud Computing. JointCloud borrows the ideas from airline alliances and aims at empowering the cooperation among multiple Cloud Service Providers(CSP) to provide cross-cloud services. JointCloud not only focuses on a vertical integration of cloud resources but also a horizontal cooperation among CSPs in the form of service-oriented computing, by which CSPs evolve along with the JointCloud ecosystem to better serve globalized computation at low cost, high availability and assured OoS.