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Aiming at the lacks in traditional information revelation and work style for geosteering drilling, a Cooperative Geosteering Drilling Virtual System Based on Network is developed by use of virtual reality and CSCW techniques. Sequentially a cooperative working virtual platform is provided for multi-domain experts and drilling technicians in different locations, which can make them achieve cooperative decision analysis and control while drilling towards drilling operating of the same well at the same time. The three-dimensional visualization of drilling process is implemented in this system using Java 3D. Consequently, it is convenient to control wellbore tracks in real time while drilling, and thus drilling success ratio can be improved. And real-time synchronization between different users' scenes is achieved based on the technique of SOCKET communication and multi-threading. Analyzing the particularity of cooperative operation in geosteering drilling, so a new concurrency control mechanism based on attribute operation in client is introduced to promote the consistency, responsiveness and concurrency of multi-user cooperation. Details are provided about the architecture' design and key techniques of the system in this paper, including the management of drilling virtual objects, constructing of virtual scene, synchronization between multiusers' scenes, concurrency control of multi-user, and so forth.