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According to the characteristics and needs of cooperative design for drilling engineering, this paper proposes to build a SOA-based cooperative design platform for drilling engineering, and this platform provides a cooperative work environment supported by the computer network for the multi-department and multidisciplinary engineering designers distributed in different locations. The architecture of cooperative design platform is designed. Using enterprise service bus technology, this paper achieves the effective integration and sharing of various sources and heterogeneous drilling information resources, and according the characteristics of task dynamic changes during the cooperative process, using access control mechanism based on task and role, the right management of multi-user cooperative design task is achieved. To improve the consistency and concurrency of multi-user cooperative operation, this paper establishes a kind of client concurrency control mechanism based on attribute operation. This paper describes in detail the key technology to realize this platform, including user right management, task processing flow, task dynamic dispatching mechanism and multi-user concurrency control of shared objects, etc.