Abstract: Prefix Bu is generally placed in the range of Bang and Zhi of the early ancient Chinese by the researchers, also regarded as the proof of the prefix *p or the coronal *pC. It is regarded as the source of Yi and Yue by using ways of document research and language comparison. Therefore the aboves do not hold.

Key words: prefix, bu, type, etymology

摘要： 词头“不”一般被研究者归在上古的帮母之部，也被当作前缀*p或复辅音声母前塞冠音*pC来源的例证。通过描写它的种类和考索语源，认为词头“不”属疑母月部，以词头“不”来构拟前缀*p或复辅音声母前塞冠音*pC的理由不充分。

关键词: 词头, 不, 种类, 语源