从类目复分加“0”研究概况和加“0”的作用出发,通过《中国图书馆图书分类法第三版使用手册》和《中国图书馆分类法》(以下简称《中图法》)第四版的实例,对能发现的隐性重号现象进行分析,指出解决此问题的对策是严格遵守加“0”规则。 Based on the overview of “0” category and the role of “0” in the category, the author uses the “Chinese Library Classification Method of the Third Edition” and “Chinese Library Classification” (hereinafter referred to as “the CLC” ) Fourth Edition of the example, we can find out the phenomenon of the implicit weights, pointed out that the solution to this problem is to strictly abide by the plus “0” rule.