数字图书馆领域的知识映射可以揭示出该主题的语义组织及知识演化。本文通过构建数字图书馆领域知识,揭示出该领域的核心主题及子主题。通过4步研究过程及知识组织的两种方法(分类法及主题词表构建法),构建出最近20年(1990-2010年)数字图书馆研究领域的21个核心主题、1015个子主题。该知识可作为数字图书馆研究、教育以及实践工作的知识平台对数字图书馆研究活动进行指导、评估。 Knowledge mapping in the field of digital library can reveal the semantic organization and evolution of the topic. This article reveals the core and sub-topics in this field by building knowledge in the field of digital library. Through the four-step research process and the two methods of knowledge organization (taxonomy and thesaurus construction method), 21 core topics and 1015 subtopics in the field of digital library research in the recent 20 years (1990-2010) are constructed. This knowledge can guide and evaluate digital library research activities as a knowledge platform for digital library research, education and practical work.