工作流管理系统通常对工作流模型进行严格的定义。然而，现实情况却是工作流实例在运行过程中常常由于信息不足或者需要的资源不可用等诸多原因，而偏离预先的定义。因此，如何解决工作流实例运行过程中的路径选择问题成为当前研究的热点。本文以前人的研究成果为基础，提出了一个基于Ontology 的柔性工作流执行框架。关键词: 工作流；柔性；本体；Web 服务；策略匹配；Abstract: Workflow Management Systems usually carry on the rigid definition to the workflow models. However, in real life situations, users should be permitted to deviate from the prescribed static workflow definition for various reasons. These reasons include the lack of information and the unavailability of the required resources, etc. So how to solve the question of router-selection in the real life execution of workflow instance becomes the hot issue in the current researches. The paper proposes an ontology-based framework for flexible workflow execution, on the base of former researches.Key words: WorkFlow; Flexible; Ontology; Web Services; Strategy Match;