：数字图书馆需要在海量的网络资源中以用户满意度为目的，检索符合用户需求的信息，为用户提供更多更优质的资源，满足用户的信息需求。文章介绍了数字图书馆层次查询模型的功能和模块，针对数字图书馆层次结构服务存在的数据处理能力低、资源内容匮乏、互动性不足等问题，提出了增加数据清洗环节、分模块细化检索过程、引入社交关系网等优化数字图书馆层次检索平台服务的策略。

The digital library has to retrieve in the mass information what the users need to provide users with more and higher quality resources. In this paper the author analyzes the information resources and hierarchical query model of the digital library platform, introduces grid technology, explains the specific advantages and service connotation of the digital library, and analyzes the degree of realizing the hierarchical service of the digital library to meet the actual needs of users. In view of the problems of low data processing ability, lack of resources and content, and lack of interaction in the digital library, this paper puts forward a series of strategies to optimize the service ability of the digital library's hierarchical retrieval platform, so as to provide users with accurate and all-round personalized information that can meet their query semantics and provide users with satisfactory services.