Through comparison and analysis of the phonetic materials in relevant dictionaries, the following conclusions can be obtained. Firstly,Hongwuzhengyun(《洪武正韵》)is the main source, from which most words of Fanqie were copied byZihui, and many words of Zhiyin were cited directly from Xiaoyun. Secondly, Chongkanxiangjiaopianhai(《重刊详校篇海》) is the supplementary source, from which words of Fanqie and Zhiyin appearing only inZihui rather than inHongwuzhengyun(《洪武正韵》) were mainly borrowed. Thirdly, the dialect in Xuancheng(宣城) can not...