Through an analysis of Zhao Yiguang's 趙宧光 Xitan Jingzhuan 悉曇經傳, this paper aims to show how Siddhāṃ comprehended and converted into the concepts of Chinese historical phonology. I also investigate Yinsheng Jiyuan 音聲紀元and Dengqie Yuansheng 等切元聲 quoted the conditions of Xitan Jingzhuan, trying to understand the spread routes and the transition of the Siddhāṃ knowledge. Xitan Jingzhuan is an important knowledge of Siddhāṃ literature in the late Ming, it will help us understand how Siddhāṃ knowledge converted into the concepts of Chinese historical phonology by means of the thought of composition and phonological theory. Moreover, this study retraces the comprehensive influences in Ming Dynasty after Siddhāṃ was spread into China.