日汉对音是指用汉字记录的古代日语的异域译音。日汉对音文献现存二十多种,是日中两国音韵学者研究古代日语和汉语音韵的宝贵资料。本文首先介绍这些资料的作者、时代、内容和容量,继而论及日汉对音研究的理论问题,重点在于日汉对音对于探讨汉语音韵史的对音学价值、可能性和优越性。最後,通过展开资料特性,以严谨科学为前提,讨论日汉对音研究时必要的方法和步骤。 Japanese-Chinese phonetic refers to the transliteration of ancient Japanese recorded in Chinese characters. There are over 20 kinds of phonetic transcriptions in Japanese and Chinese, which are precious data for phonological scholars in Japan and China to study ancient Japanese and Chinese phonology. This paper first introduces the author, age, content and capacity of these materials, and then discusses the theoretical issues of Japanese-Chinese phonetic research, focusing on the phonetic value, possibility and superiority of Japanese-Chinese phonetic transcription to explore the history of Chinese phonology. Finally, we discuss the necessary methods and steps in the study of Japanese-Chinese phonetics by starting with the characteristics of data and taking rigorous science as the prerequisite.