本研究探討的是知章組聲母的語言接觸，並以花蓮縣瑞穗鄉為研究場域。為探討當地的語言接觸，筆者親自訪問9 位當地長期居住之居民，並自製詞表進行訪問。筆者認為語音變化來自於閩南語和客語之間的外部接觸，而產生語音內部的變化，也就是從舌尖元音〔-ï〕讀做前高元音〔-i〕的省力變化與舌尖元音〔-ï〕的音位中立化後，併入〔-i〕韻，接著顎化（Palatalization）至舌面前音〔tɕ-〕。本研究從地理語言學角度進行解釋，研究發現，瑞穗客語的語音創新點分做兩個，四縣客語以瑞穗村為中心點發散；海陸客語則是以瑞祥村為中心點發散。而各發音人所呈現的語音資料，經過計算，筆者發現越遠離中心點的方言點，則變化程度越小，符合過去研究所說「古語殘存於邊境」一說。

This study investigates the language contact phenomena involving the Zhi-Zhang initial （知章組聲母） consonants in the Hakka dialect of Ruisui （瑞穗）Township, Hualien（花蓮） County. To explore local patterns of contact, we conducted field interviews with nine long-term residents using a self-compiled wordlist. We argue that the observed phonological changes stem from external contact between Southern Min and Hakka, leading to internal phonological transformations. Specifically, the transition from the apical vowel [-ï] to the high front vowel [-i] reflects articulatory simplification. After the phonemic neutralization of [ɿ], it merges into the [-ï] rhyme, followed by palatalization into the alveo-palatal affricate [tɕ-]. From a geolinguistic perspective, the study identifies two centers of phonological innovation in Ruisui Hakka: in the Si-ien dialect（四縣客語）, innovations radiate from Ruisui Village; in the Hailu dialect（海陸客語）, from Ruixiang Village（ 瑞祥村）. A quantitative analysis of the speakers’ phonological data reveals that dialect points further from these centers exhibit less change, confirming the traditional observation that “archaic forms are preserved in peripheral areas.”