本文介绍了基于Web Service的工作流系统的结构以及工作元模型的相关概念,着重分析了几种具有代表性的工作流元模型,最后探讨了工作流元模型的改进方法。 This paper introduces the structure of workflow system based on Web Service and the related concepts of working metamodel. It focuses on analyzing several representative workflow metamodels, and finally discusses the improved methods of workflow metamodel.