Translators are indispensable intermediaries in East Asian traffic. Due to the limitation of official history books in the Chinese cultural circle，the historical events of the translators are scattered in the historical books sporadically，with complicated appellations and multiple responsibilities. They come from different tribes，and their functions involve translators，messengers，guides and many other roles. The education and cultivation of the translators needed by the Central Plains Dynasty for itself and the surrounding regimes run through the whole process of historical development and are constantly improving. This group is active in every link of East Asian traffic and runs through the historical development of East Asia. It not only builds a bridge for regional exchanges in East Asia，but also promotes the understanding and integration of East Asia. It is an important element of regional integration in ancient East Asia.