Abstract: Concerning the shortcomings of current PDM systems, a comprehensive security strategy is put forward. It consists of clustering static security model, dynamic security model based on Petri net, hierarchical distributed security model and default security model. Algorithm of each model is briefly introduced. Its implementation approach on ZD-PDM system and some problems under research are discussed. The model proposed in this paper can be used not only in PDM system, but also in other management information systems.