According to The Eight Tones of Kien-chou (建州八音), a rime dictionary published in 1795, the Jian'ou dialect had 15 initials, 34 rimes and 7 tones in the 18th century, however there are only 6 tones in the modern dialect as the "light level" (陽平) tone has disappeared.
The entering tones in the Jian'ou dialect do not have any entering tone coda (入聲韻尾) such as /-ʔ/, /-p̚/, /-t̚/ and /-k̚/ which makes it distinct from many other Chinese varieties.
Notes
^Min is believed to have split from Old Chinese, rather than Middle Chinese like other varieties of Chinese.[1][2][3]
References
^Mei, Tsu-lin (1970), "Tones and prosody in Middle Chinese and the origin of the rising tone", Harvard Journal of Asiatic Studies, 30: 86–110, doi:10.2307/2718766, JSTOR2718766
^Pulleyblank, Edwin G. (1984), Middle Chinese: A study in Historical Phonology, Vancouver: University of British Columbia Press, p. 3, ISBN 978-0-7748-0192-8
Beijing daxue Zhongguo yuyan wenxue xi yuyanxue jiaoyanshi 北京大學中國語言文學系語言學教研室 (1989). Hànyǔ fāngyīn zìhuì 漢語方音字匯 (in Chinese). Beijing: Wenzi gaige chubanshe.
Yuan, Jiahua 袁家驊 (1989). Hànyǔ fāngyán gàiyào 漢語方言概要 [An Introduction to Chinese Dialects] (in Chinese). Beijing: Wenzi gaige chubanshe.
Jianou Xian difangzhi bianzuan weiyuanhui 建瓯县地方志编纂委员会 (1994). Jiànōu xiànzhì 建瓯县志 [Chorography of Jian'ou County]. Vol. 36. Beijing: Zhonghua shuju. ISBN 7-101-01283-3. Archived from the original on 2018-04-07. Retrieved 2018-04-06.