中古陽平字在閩北方言裡有四種臺能的讀法，分別是「陽平甲調不送氣音」、「陽平甲調送氣音」、「陽平乙調不送氣音」與「陽平乙調送氣音」。本文討論這個方言區裡陽平甲乙調的不送氣音。閩方言應屬於「濁音清化不送氣」的類型在閩北，多數中古全文聲母平聲字讀作陽平甲調，例如「婆堂銅除池齊情群牌提」等字的方言讀者。臺是在這些方言裡，也同時臺以到少部分中古全濁平聲字今讀陽平乙調的現象，例如「婆蹄茶槽牆錢晴」等字的讀音。建甌是個兼有陽平甲調及陽平乙調不送氣清音的方言，本文藉由建甌「婆」字及其複合詞討論為閩北地區陽平乙調不送氣清音其實是受閩南方言的影響。

　　　　　The reflexes of Middle Chinese Yang-Ping (陽平) in Norther Min Dialects may be first aspirated tone, first unaspirated tone, second aspirated tone or second unspirated tone. In this paper, the discussion concentrates on the two unaspirated tones. The fact the「婆」varieties in different compounds of Chian-ou (建甌) shows that the first unaspirated tone is the real reflex which corresponds with other Min dialects, while the second one should be contributed to the contact between this area and Southern Min.