[Purpose/significance] The maturity of virtual digital human technology has brought new opportunities and challenges to the development of libraries. As a new type of active entity, virtual digital humans will be an indispens⁃able role for libraries in providing information services in the future, especially in the metaverse. This article, from the perspective of the information service ecosystem, deeply explores the construction and implementation path of the li⁃brary's virtual digital human service model under the background of the metaverse, aiming to provide a theoretical refer⁃ence for the future service construction of libraries. [Method/process] Based on the theories of information ecology and service ecology, this article conducts a systematic analysis of the various elements in the library's virtual digital hu⁃man information service ecosystem. Based on this analysis, a library virtual digital human information service model is constructed. Furthermore, the specific implementation path of this model is explored in-depth from six different dimen⁃sions. [Result/conclusion] This article provides a new theoretical framework and practical guidance for libraries to car⁃ry out virtual digital human services. It clarifies the role positioning and functions of various elements in libraries' provi⁃sion of virtual digital human services. At the same time, this article also provides useful references and insights for sub⁃sequent research and practice, contributing to the advancement of library information services to a higher level.