Abstract: What is the Internet? This is a theoretical and practical problem to ask. The different understanding of the network can lead to different network behavior and different network reality. Understanding network need to grasp the different levels of human network interactive relation, namely "human-artifacts"-the main preparation technology of interaction as the leading level; "human-interface"-perception interactive hierarchy; "human- cyberspace" interaction-information interacted level; "people-network life world"-significance interactive level. In different levels, the form and content of people's interaction with the web is different and the influence of network on people is different, so people will understand the network in a dynamic process, in order to be more effectively identify network, use network, and manage network.