Digital Libraries were emerging on the demands of efficient manipulating of information resources. What digital libraries focus on are the main problems of the Internet:the difficulties of locating the required information, the interoperability of heterogeneous information, and manipulation mechanism of the large amount of information. The key technologies of digital libraries include the efficient organization of digital information, the interoperability of information repositories, and the infrastructure of digital libraries. The purpose of digital libraries is to realize the unified information retrieval across repositories,provide a virtual integrated information net. The main part of this paper introduces three influential digital library architectures, InterSpace, InfoBus and Agent-based architecture. In the end, the technologies todesign and to implement the architectures of digital libraries are summarized, the developing trend is anticipated.%数字图书馆(Dlib)主要是为了解决信息资源的有效利用而产生的。数字图书馆要解决的是现在Internet存在的主要问题：信息查找困难、异构信息仓储的互操作性和缺乏对大规模分布数据的操作机制。Dlib的关键技术是研究数字化信息的有效组织结构，解决各个信息仓储间的互操作性，形成Dlib基础体系结构以有效地操作大规模的、分布的数字化信息。其目标是实现跨仓储的统一检索，为用户提供一个虚拟的、统一的信息网络。文章重点介绍了国际上有影响的三大数字图书馆体系结构：互联信息空间(Interspace)、信息总线(InfoBus)和基于代理(agent)的体系结构。最后，文章总结了Dlib体系结构设计和实现的技术特点及其发展趋势。
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