本文以对学科馆员工作的宏观理论探索为主,从对关键概念的辨析入手,指出学科服务的本质是整个学科馆员理论研究中的核心和基础。通过对知识服务及其理念的详细阐述及深入分析,认为学科服务在本质上属于知识服务,它所呈现出的“学科服务三原则”体现着知识服务的特点,而学科馆员则在宏观上扮演着知识服务践行者的角色。 Based on the macroscopic theoretical exploration of subject librarian’s work, this dissertation begins with the discernment of key concepts and points out that the essence of subject service is the core and foundation of the theoretical research of subject librarians. Through elaborate and in-depth analysis of knowledge service and its concept, it is considered that the discipline service is essentially a knowledge service, and the “three principles of discipline service” that it presents shows the characteristics of knowledge service while the subject librarian Macro play the role of knowledge service practitioner.