[目的/意义] 以孟连生先生为个案，探寻20世纪70年代末以来先生在图书情报领域的工作实践及相关研究，分析其学术影响，回顾中国现代图书情报事业发展历程，领会图书情报事业发展的要义。[方法/过程] 采用文献内容分析法，结合先生自述资料，梳理先生从业实践与研究成果；采用文献计量法分析先生学术影响。[结果/结论] 先生知行合一，他在引文分析、信息资源建设、信息服务、数字图书馆建设、国家科技图书文献中心建设方面的实践与研究相得益彰。先生的学术影响主要来源于其问题导向的实践研究与思考。先生在图书情报工作领域的实践与图书情报事业相关的研究体现出图情事业发展的六个要素：资源，技术，管理，服务，科研，人才。资源为根，人才为本，技术提效，服务立馆，学术兴馆，管理强馆。

[Purpose/significance] Taking Mr. Meng Liansheng as a case, this paper explores his library and information professional practice, related research and academic influence since the end of 1970s. The purpose is to review the development of modern librarianship in China, and comprehend the core elements of library development. [Method/process] Literature content analysis combining with Mr. Meng’s self-reported materials were used to sort out the practice and research achievements of Mr. Meng’s library and information work. A bibliometric method was used to analyze Mr. Meng’s academic influence. [Result/conclusion] He is honest with himself, his practice and research in citation analysis, information resource construction, information service, digital library construction and the construction of the National Science and Technology Library complement each other. His academic influence stems mainly from his problem-oriented practical research and thinking. The professional practice and the related discourse on library and information work by Mr. Meng reflect the six elements throughout the development of library and information work: information resource, technology, management, service, scientific research and qualified personnel. Information resource is the root. Qualified personnel is the foundation. Technology improves the efficiency. Service builds the library. Academic research prospers the librarianship. And management makes the library strong.