：人工智能技术发展，驱动着图书馆的知识服务向着个性化、精准化方向发展。文章在概述知识发现和用户画像的基础上，构建了图书馆读者用户画像，以此构建了基于用户画像的图书馆知识发现服务模型。分析发现，基于用户画像的图书馆知识服务，能在服务的个性化、精准化方面有着一定的优势，能够提升图书馆知识服务体验。

The development of artificial intelligence technology drives the library's knowledge service towards individuation and precision. Basic on the summarization of knowledge discovery and User portrait, this article constructs the user portrait, so as to construct a service model of library’s knowledge discovery. It is found that the library knowledge service based on user portrait has some advantages in personalized and precision service, and also can improve the experiences of library knowledge service.