The combination of workflow technologies and software application systems is one of the research directions in computer application area. On the basis of researches of workflow technology, a Web-based Workflow System (WebWFS), which is based on script interpreter and is independent of application data, is presented. OOD method is used in workflow engine and a description language basedon the script and a IIS Filter are discussed. In order to verify the adaptability of WebWFS, a example which is a plan management module of MIS is presented for analyzing the process of application of WebWFS. The conclusion is that WebWFS is reusable and flexible.