Based on researches on NGI (next generation internet) architecture and its related techniques carried out by Sichuan Network Communication Technology Key Laboratory, NGI development strategy and its architecture were discussed comprehensively. The emphasis was given to NGI framework at the laboratory, including NGI development strategy BSF-OES (backbone substrate first, outwards extension second), SUPA (single-layer user-data switching platform architecture), EPFTS (Ethernet-oriented physical frame timeslot switching), and future ONASM (open network and application service model). In addition, it was discussed how to meet the challenges such as high-speed switching, QoS insurance, security, and mobility with the framework of SUPANET (single-layer user-data switching platform architecture network) and how to realize the goal of NGI.