This paper proposes an online co-browsing scheme based on RTMP. With this scheme, users can browse through all kinds of documents on web, and documents can be synchronized to share with others. First, all kinds of documents are converted to Flash online, and then client Flash files are used to call Flash files that the document has converted to on online browse. A web client can also be used to control document pagea up, down, drag, and zoom. With Red5 media server, based RTMP, the“shareobject” can be used to browse in sync with others. Critical issues in systems are document conversion, document transfers, and Co-Browsing. This system enbunres document online browsing and adds synchronized browsing to increase work efficiency.