Categorizing dialect and the phonetic notation (《方言類釋》) written in 1778 is a specialized dictionary which collected and recorded Chinese language vocabulary in the middle of Qing dynasty. As far as stylistic rules and layout is concerned, Chinese character was the main index and their pronunciations of Mongolia, Manchu, Japan, and Korean were recorded in Korean alphabet spelling. Xu Mingying (徐命膺) and Hong Mingfu (洪命福), who accepted the king's command, wrote the book so as to easily communicate with Japan and China. Chinese language had been changing. On the contrary, North Korean language conserved a lot of ancient Chinese words leading to a lot of problem communication with the Chinese. This is the reason why two authors had to accept the king’s command to finish the book. The book included abundant Chinese vocabulary also with "Chinese dialect" from Guangzhou, Guangdong province, Shanxi Fen states and southern Jiangsu, Hunan Changsha. These materials are the most valuable complement for the research on the history of modern Chinese history. At the same time those exterior material can also be added by Chinese scholars in the Qing dynasty for enriching interior dictionaries. At the same time, the dialect also provided such clues that are vocabulary rooted in powerful dialect.