This study attempts to examine the differences of the language policy formulation and implementation during the two significant early periods of Ming dynasty (1368-1644). It uses a historical comparative perspective to understand the processes involved in language change. In order to deal with the relationship between Mongolian and Chinese and to develop a system to regulate language use for Chinese, the early Ming government enacted a series of language policies. There were both similarities as well as differences in the policies made by Zhu Yuanzhang and Zhu Di, the two paramount rulers of the Ming dynasty. Whereas the policies during Zhu Yuanzhang time manifested in repression of Mongolian through implementing acculturation measures such as intermarriage between Mongol and Chinese, Zhu Di paid more attention to language harmony characteristic of liberalism toward Mongolian language. Zhu Yuanzhang standardized written language based on then authoritative Nanjing speech. He set up an education system to propagate both a national lingua franca and a vernacular with latter playing important role in promoting the technological advancement. Zhu Di’s regime was also remembered for its efforts in promulgating foreign language education policies, thus on the one hand to establish a rapport with neighboring countries in East Asia,Southeast Asia and the inner Western Asia, and on the other hand, to promote the international spread of Chinese language in these regions.