“Hongwu Zhengyun” became a book in the 8th year of Emperor Hongwu of the Ming Dynasty (1375). It is an official rhyme book compiled by 11 people such as Yue Shaofeng and Song Lian. Emperor Zhu Yuanzhang ordered the compilation of this rhyme book to set the “Zhongyuan Yayin(Main land positive sound)” for the country, and let the people and the intellectuals use “Hongwu Zhengyun” as the standard of the positive sound. Emperor consolidate its centralization through unified sound system of the country. As a close neighbor of China, Korea has been infiltrated by Chinese culture since ancient times. In the Joseon era, the Joseon Dynasty attached great importance to the study and examination of the standard pronunciation of Chinese characters, because of the rhetoric for writing Chinese poetry and pronunciation specification. After the book “Hongwu Zhengyun” was written, it was introduced to the Joseon Dynasty and received attention. It was regarded as the most authoritative standard rhyme book in China. “Hongwu Zhengyun” as a “positive” knowledge system that represents the will of the state and regulates the pronunciation of Chinese characters, has been widely and long‐lasting spread in various ways in the Joseon Dynasty, and has had a tremendous impact on the Sinology and rhyme compilation in the Joseon era. This paper starts with the background of the dissemination of “Hongwu Zhengyun” in the Joseon era, and examines the form of dissemination of “Hongwu Zhengyun” in the Joseon Dynasty and its influence on the Joseon era. Thus this paper depicted the dissemination of “Hongwu Zhengyun” as a knowledge system in the Joseon Dynasty. “Hongwu Zhengyun” as an authoritative “positive sound” knowledge system of the Ming Dynasty, In the Joseon Dynasty, there were four kinds of dissemination forms: the lectures, the imperial examinations with rhyme of poetry, the orthographic specification and the reprint. The dissemination can be seen in the records of “the Annals of the Joseon Dynast”, “Seung Jung Won Diary” and the records of Korea intellectuals. Through these methods, “Hongwu Zhengyun” has been widely and long‐lasting spread in the Joseon Dynasty, and the knowledge system what it represented has also been accepted and recognized by the Korea intellectuals. This dissemination of foreign knowledge system is not only the result of the state power dominated by the top of the Joseon Dynasty, but also the spontaneous acceptance of the intellectuals and the underlying people from the bottom up. Through the interaction of the both, a knowledge system can be spread among countries and solidified in the countries that which accept the knowledge system. The reason is that China and Korea are geographically closed, so the similar political and cultural factors make this special knowledge system of rhyme book spread between the two countries. The Joseon Dynasty had always attached importance to Sinology, so the choice of Chinese phonology is an important issue concerning the orthodoxy of language. This is both the need of the national language policy and the need for the dynastyʹs authoritarian rule. Through the spread of “Hongwu Zhengyun” in the Joseon Dynasty, the knowledge system and state power was combined and it has written a chapter of knowledge circulation and change in the history of China and Korea.