本文借助文献材料和笔者的实地调查材料,考察了二百年来北京话清入字归调的变化。文章以《李氏音鉴》等材料分别代表前、中、后三个时期的北京话,选取材料中共有的245个常用清入字,逐个考察它们在不同时期的异读、调类归并及读音的保留、增减和转移等情况,从内因和外因两个方面对二百年来北京话清入字的演变进行了解释。 This article examines the changes of Beijing dialect clear words in the past 200 years with reference to the literature materials and the author’s fieldwork materials. The article uses the materials of “Lixuejianjian” and other materials to represent the three periods of Beijing dialect before, during and after, respectively, and selects 245 commonly-used words which are commonly used in materials and examines them one by one in different periods, Such as the reservation, addition, subtraction and transfer of social capital, explained the evolution of Beijing dialect clear words in two centuries from internal and external causes.