In the early Joseon when royal authority was not still firmly established, King Taejong, or Lee Bang Won tried to make their political position guaranteed through relationships with Ming, making efforts to develop relations with the Chinese nation positively. This political orientation towards Ming by of the king Taejong was also clearly reflected in the settlement of official uniform in the early Joseon, which can be described as follows. Gaoming(誥命), Yinxin(印信) and Mianfu(冕服) granted by Ming for the first time since the foundation of Joseon suggested that the Chinese nation recognized the formal settlement of Joseon dynasty and the inauguration of King Taejong. presumedly, the grants played a critical role in the firm establishment by King Taejong of his royal authority under unstable political conditions. Under the reign of King Taejong, Joseon tried to abolish ancient regime and, instead, accept systems and institutions of Ming as it maintained smooth relations with the Chinese nation. King Taejong whose royal authority was locally deemed lack in legitimacy and morality wanted to receive the moral recognition of his reign. So the monarch tried to not only strengthen his authority, but also take in advanced culture and civilization through submissive diplomatic relations with Ming. This was a practical diplomatic strategy that was clearly discriminated from toadyism. It was a policy towards Ming, pursuing substantial national benefit. Therefore, official uniform system under the reign of King Taejong should be understood accordingly.