The problems of narrow knowledge, insufficient cross-cultural communication ability and critical thinking ability of English majors have attracted the attention of many researchers, and it is also a stubborn problem that needs to be solved in the National Standard for Teaching Quality of Foreign Languages and Literatures. This paper applies Karl Maton’s Legitimation Code Theory to analyze the legitimation code of the Cross-cultural Communication course from five dimensions of autonomy, density, specialization, semantics and temporality, and explores the contradiction between the horizontal knower structure and hierarchical knower structure. On this basis, the integration of horizontal discourse and hierarchical discourse in the Cross-cultural Communication course construction is proposed, and a feasible curriculum design which focuses on “knower structure” instead of “knowing structure” is also proposed to provide some enlightenment for improving students’ cross-cultural communication ability and critical thinking ability.