In the East of the Tibetan-Yi Corridor,the mutual cultural accultaration is obvious,for the reason of the two nationalities getting well with others.The marriage customs in Tibetan of Ersu and Yi Nationalit of Liangshan embody the state of cultural ferment.There is a comparison between the Tibetan of Ersu and Yi Nationalit of Liangshan of their marriage system,marriage protocol and national faith by feild survey in this article.