本文仅就修订《中国图书资料分类法》（以下简称《资料法》）第三版中国医学类的分类深度与类目体系扩充问题谈谈自己的看法。 一、《资料法》的分类深度 分类深度,是指在文献积累过程中与之相适应的类目体系的逐级扩充。早在1911年英国图书馆学家赫尔姆就提出:“如果已知关于某一主题存在,则应将该主题的术语定为类目”。我国图书馆学家刘国钧先生就分类深度 This article only talks about revising the classification depth of Chinese medicine and the expansion of the category system in the third edition of “Chinese Library and Information Science Classification Law” (hereinafter referred to as “Data Law”). I. Classification of “Data Law” The depth of the deep classification refers to the gradual expansion of the category system that is compatible with it in the process of document accumulation. As early as 1911, British library scientist Helm put forward: “If there is known about the existence of a topic, the topic should be the term as a category.” Our country library scientist Mr. Liu Guojun depth classification