thedigital library is the planning and management of video, voice, literature system using a variety ofinformation, with the development of the information age, the digital library will gradually replace the traditional library,the calculation model of diverse and complicated data resources in urgent need of cloud computing, this kind of management system in digital library, the underlying architecture of cloud computing mode can the formation ofcreative digital library, application platform, data sharing and other functions model, to provide convenient servicesfor customers, therefore, this paper introduces the application of cloud computing in the digital library from three aspects, and further puts forward the security of cloud computing and defensive.%数字图书馆是将视频、语音、文献资料等各种信息采用系统化的规划进行集中管理，随着信息时代的发展，数字化图书馆管逐步取代传统图书馆，数字图书馆管理系统中多样化且复杂化的数据资源迫切的需要云计算这种计算模型，云计算的模式可以创造性的形成数字图书馆的底层构架，应用平台、数据共享等功能模式，为客户提供便捷的服务，因此，本文从三个方面介绍了云计算在数字图书馆中的应用，并进一步提出云计算的安全性和防御性。
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