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Before the implementation of product data management (PDM) system, person model and enterprise process model (EPM)must be firstly established. For the convenience of project management, all the related users must be allocated to the “Person-User-RoleGroup” net. Based on the person model and the direction of iniformation flow, the EPM is established subsequently. The EPM consists of several release levels, in which the access controls are defined. The EPM procedure shows the blueprint of the workflow process structure.The establishment of person model and EPM in an enterprise has been instanced at the end of this paper.