Z39.50 is a standard network protocol of information retrieval, especially used in the fieldof online bibliographic retrieval. In this paper, firstly, we discuss the technology of online bibliographic re-trieval service based on Z39.50 and the problem of the current structure is presented. Secondly, we pre-sent a distributed architecture that uses the technology of query routing. Thirdly, the basic technology,such as the buildup of Marc index, fetching of the centroid information and loop control are discussed.The system architecture and technology that is presented in the paper increase the query efficiency of dis-tributed resources in the digital library.%Z9．50是网络信息检索的标准协议，目前主要应用于联机书目检索领域。本文首先探讨基于Z39．50的联机书目检索的技术以及目前面临的问题，然后提出一个应用查询路由技术的分布式结构，并讨论了MARC索引的组织，节点质心信息的提取，查询循环控制等关键技术。文中提出的系统结构和实现技术有助于提高数字图书馆环境中分布资源的查询效率。
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