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King Kojo's 9 years reign in the Tang dynasty was in the process of the founding of a nation and the unification into an empire through his positive diplomacy. And the comings and goings of envoys among Tang and its foreign nations underwent a change with the expansion of its domestic influence. Kojo dispatched envoys to the foreign countries 19 times during his reign, and 13 of them fell to the Turks. At that times various kingdoms in China, including Tang, felt keenly the necessity of the cooperation with the Turks, a northern supreme ruler. Then Tang frequently dispatched envoys for entering into friendly relations with him. But the dispatch was strikingly diminished after the year 622, when Tang succeed to repulse various ethnic nations in the neighborhood. On the other hand, Tang began to dispatch hwachinsa, envoys for friendship, to Silla, western Turks, Koguryo, and Baekje from the end of the year 621 on The types of the envoys dispatched during Kojo's reign could be classified into requesting troops, alliance, friendship, investiture, a call of condolence, appeasement, reply and assassination. Among them the dispatch of the envoys for friendship was extremely most in number. And it must be remembered that the envoys for reply, alliance, investiture, a call of condolence, and appeasement were also sent for friendship. Kojo was facing a serious crisis even until 624, when he tried to give up hadong district or to transfer the capital to other place. He had no time to practice a policy of expansion. Therefore he had sent no one anmusa who might have a possibility of collision and political discord with foreign nations. The dispatches of seyusa for appeasement were only for a formal protest. And through chaekbongsa, he gave investiture except titles to kings of other countries. This meant that it was just an establishment of diplomatic relations for friendship. Such a flexible or positive diplomatic policy of Kojo served as a stepping-stone for the foundation and the unification of the empire Tang.