This paper presents a research prototype of topic maps repository. The main purpose of this repository is to promote knowledge structure sharing and reuse in representing and organizing information resources. The overall architecture of the repository includes a relational database (using MY-SQL), an XML-enabled application server, a customized XML schema for Topic Maps, a set of XML stylesheets for transforming and displaying topic maps, a set of Java servlets and jsp programs to generate XML files dynamically from the database, and a web interface for browsing and authoring topic maps. Through the interface, a user can create topic maps without having to know the syntaxes of topic maps and XML. The user can add or modify topics, occurrences, associations and other related information directly on the web. The user can also upload an XTM topic map file into the repository or export a topic map to an XTM file.