中古陽聲韻在現今官話方言中雖保存著鼻音韻尾，但面貌不盡相同。位在中原官話區較外緣的山西運城方言更是呈現了多樣性：一、鼻音韻尾；二、鼻化韻；三、純元音韻。多樣形式的表現，其實是由內部不同的語音發展階段及文白層次疊置所交織出的複雜結果。來自中古陽聲韻的咸、山、深、臻等四攝兼有鼻化韻及純元音韻的表現，而曾、梗、通、宕、江等五攝在保有鼻音韻尾外，白讀同時擁有純元音韻。研究中古陽聲韻在運城方言裡的動態演變過程、發展的速率以及文白異讀的語音層次，幫助我們了解漢語方言鼻尾消變的模式、因素及演變的機制。在共時的角度之外，也探究了音變歷時的發展脈胳，在比對同區域的古代西北方音譯音文獻時發現，古今鼻韻尾的消變、速率與各攝合流的細節情況不盡相同，未必具有直接繼承的關係。

Yangshengyun (陽聲韻) in Mandarin dialect still holds a nasal final, the Shanxi Yuncheng (運城) dialect in the outer edge of Mandarin dialect presents a variety of appearances: A, nasal final; Second, nasalized rhyme; Third, pure vowel rhyme. The expression of various forms, in fact, is the result of the internal complex voice development stage and superposing colloquial-literary strata. The Xian-shan-shen-zhen she (咸山深臻攝) has both of the representation of nasalized rhyme and pure vowel rhyme. The Zeng-geng-tong-dang-Jiang she (曾梗通宕江攝) retains nasal final, but also have the colloquial- reading sound of the pure vowel rhyme. By exploring the dynamic evolution and the different selection of literary-vs.-colloquial readings of Yangshengyun (陽聲 韻) in Yuncheng (運城) dialect, it will help us to understand the evolution mechanisms of nasal final.