Taking OSI FTAM ( File Transfer, Access and Management) service as a case study, this paper explained at length the concepts, tools and standards established for the semantics transfer in OSI context. 本文以文卷传送为实例,阐述了OSI为实现语义传送而提出的概念、工具与标准,探讨了这个在OSI中较为难以理解的领域。