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Media synchronization techniques for Web-based distance learning are introduced. As we know, the distance learning system is a typical multimedia application system. It involves many kinds of information media, for example, video, audio, graphics and text. The outstanding property of a distance learning system is that these media information are not independent, they have a temporal and spatial relationship to some extent. After transmission through the network, how to keep the synchronization relationship of these media information is the central issue in distance learning system. In this article, some media synchronization techniques are discussed in detail. Considering the property of video and audio information, we also present a network multicast solution.