引言 1989年、1990年,《杜威十进分类法》(以下简称DDC)第20版和《中图法》第3版相继问世。无论是DDC还是《中图法》,作为当今有效的分类工具,其生命力均来源于不断修订。为此,特撰此文,从修订原则、修订重点、修订中为方便分类法的使用而采取的辅助措施、修订工作的组织与管理等四个方面,将 Introduction 1989, 1990, “Dewey Decimal Classification” (hereinafter referred to as DDC) 20th Edition and “Chinese Library Classification” third edition have come out. Both DDC and Chinese Library Classification, as an effective classification tool today, derive their vitality from continuous revision. To this end, this article essay, from the revised principles, revised priorities, amendments to facilitate the use of taxonomy to take the auxiliary measures to amend the work of the organization and management of the four aspects of