In the new era, amidst the trends of curriculum ideological and political education, new liberal arts construction, and telling China’s stories well to the world, how traditional English grammar courses can break free from constraints such as being boring and tedious, seize opportunities, and make breakthroughs is a new challenge and opportunity facing university English teachers. This paper explores three approaches - content-based, situation-based, and authentic materials-based - to integrate cross-cultural international communication with university English major grammar teaching. Through combining English, grammar, discourse, ideological and political education, culture, and international communication, it is significant to cultivate international talents with Chinese depth, global breadth, and humanistic height, as well as cross-cultural communication leaders while solidifying students' grammar foundation.