Use Case Model is the most important model in UML. This paper discusses a particular application of using Enterprise Use Case model and System Use Case model to build Use Case model in digital library system.

• UML中最重要的是Use Case建模,文章围绕高校数字图书馆系统对利用将Use Case模型分为企业模型和系统模型来建立数字图书馆系统Use Case模型做了详细的描述。