The dynamic adaptive capability ofworkflow management system mostly base on the dynamic support capability of process model. Process recta-model is the model to describe process model. A set of process recta-model that can describe dynamic character is very useful for dynamic and flexible problem solving. This paper analyzes and discusses the dynamic character of process model, as well the process meta-model defned by Workflow Management Consortium （WfMC）. Based offthis, flexibility workflow definition, synchronizer, transformer etc new elements are introduced to enhance and expand process defrmition meta-model. The process meta-model after enhancement and expansion is capable of more flexibility and re-structurebility. The introduction of transformer does some foundation work to enhance the intelligence of process meta-model. Furthermore, enhancement and expansion are done for the WPDL which is the definition language.%工作流管理系统的动态自适应能力在很大程度上取决于过程模型的动态支持能力。本文分析和讨论了过程模型的动态特性和工作流管理联盟WfMC定义的过程元模型。在此基础上，引入柔性工作流定义、同步器、变换器等新元素，改进和扩展过程定义元模型。改进和扩展后的过程元模型具有更大的柔性和重构性。由于引入了变换器，为增强过程元模型的智能性做了基础性工作。另外，对描述过程元模型的定义语言WPDL也做了改进和扩展。
展开▼
