The rapid development of the network technology greatly expands information communication between people and makes the network education become real. Network education has already been an important educational mode, while the teaching information system is one of the most important foundations to make the network education real. This article analyzes the basic characteristics of network classroom teaching, illustrates the required basic conditions of the online teaching based on the network and designs the network teaching system. This system can support the information communication between various forms for teaching and learning activities. Main functional subsystems include: video and audio interactive system, text interactive system, whiteboard interactive system, file-sharing system and management system, etc.