本文从历史语言学的角度对蒙古语和朝鲜语的序数词词尾做了历史比较研究,结合对突厥语族语言和满语的序数词尾的观察最终推断蒙语的-dehi/dahi和朝鲜语的-jahi/-chahi为同源成分,阿尔泰语系语言的序数词词尾可分为两类,一类是蒙古语的-?i,古代突厥语的-?i/-n?i和满语的-?i,以及朝鲜语的-cha/-chai/-ja/-jai,另一类是蒙古语的-dahi/-dehi,突厥语族语言的-diki/tiki,还有朝鲜语的-jahi/-chahi。 This article makes a historical comparison of the suffixes of Mongolian and Korean ordinal numerals from the perspective of historical linguistics and concludes with the observation of the suffixes of the ordinal numerals of Turkic languages ​​and Manchu that Mongolian-dehi / dahi and Korean- jahi / -chahi are homologous components. The suffixes of ordinal numerals in Altaic languages ​​can be divided into two categories, one is Mongolian -? i, the ancient Turkic -? i / -n? i and Manchu? i, and Korean -cha / -chai / -ja / -jai, the other is Mongolian -dahi / -dehi, Turkic -diki / tiki, and Korean -jahi / -chahi .