CARSI, abbreviated from CERNET (China Education and Research Network) Authentication and Resource Sharing Infrastructure is one of the CERNET basic services that is managed by the CERNET Network Center, initiated and headed by the Computer Center of Peking University and supported by CERNET Corporation. CARSI provides Federation authentication and global academic information resource sharing services for universities and research institutes that have established unified identity authentication of the campus network. By joining CARSI, teachers and students in colleges and universities can directly access academic resources such as e-journals and e-books purchased by schools anywhere outside the campus without confirming their identity through campus IP address and using VPN, as well as special resources such as a genuine PDF editor, high-performance computing resources, patent data, etc. Teachers and students who are outside the campus can avoid the congestion and delay caused by the use of a VPN.