文章对汉语北方官话方言中存在的数量结构合音词加以分析对比,探讨合音的音系机制,梳理方言间合音的过程差异。跨方言的对比分析发现,汉语北方官话方言中数词+“个”合音的过程并不是同期进行的,不同数词与“个”的合音过程是在不同的历史时期完成的。虽然合音形式存在不同程度的方言差异,但合音的基本音系机制是相同的;方言间的差异主要是各个方言中相关韵母演化的不同方向和不同方言利用的音系规则数量多寡造成的。 The paper analyzes and compares the quantitative structure coexist words existing in the dialect of northern Chinese dialect, probes into the phonological mechanism of the coherent tone, and combs the process differences between co-dialects. A cross-dialect comparison analysis found that the process of pronouncing the number + “” in the dialect of Chinese northern dialect is not carried out in the same period, and the vocalization process of different numerals and “” is completed in different historical periods of. Although the chorus forms have different degrees of dialect differences, the basic phonological mechanism of chorus is the same. The differences between dialects are mainly caused by the different directions of vowel evolution in different dialects and the number of phonological rules used by different dialects .