“Chao Xian Guan Yi Yu” is included in the C version of “Hua Yi Yi Yu”, recorded more than five hundred vocabularies about astronomy, geography, hunman affairs and so on in Ming dynasty. The material were all written by Chinese characters. It is not only the vital material for researching Korean language, but also an important clue for the study of official phonetics in Ming Dynasty. Until now most of the relative research are concentrated on Korean phonetics part. Ming dynasty's Chinese characters and phonetics are saved in “Chao Xian Guan Yi Yu". At the same time, as officially translated document uses characters for recording Chinese phonetic and vocabulary information, reflecting the situation of Mandarin at that time. The purpose of this paper is to study the accurate time of the book, background and the characteristics of Mandarin phonetics and vocabulary at the time of “Chao Xian Guan Yi Yu” based on the phonetics and vocabulary provided in the data, and determine that which Mandarin was offically used at that time through the phonetic and vocabulary of Chinese. 저