Abstract: The author analyzed writing of Yi's bilingual poet Akuwuwu by using the “threshold theory” of anthropology, and tried to explain the deep cultural structures of Akuwuwu's writing. Firstly, Yi culture is his native culture and structure, his poetry presented an ethnic culture. On the other hand，the threshold writing of antistructure state made his poets basing and transcending nationality and with the festures of openness and cultural fusion.