In an era of cultural diversification, integrating modern urban development with traditional national culture has become increasingly crucial. In the landscape design of the city square, how to effectively incorporate Mongolian cultural elements into landscape design, make the city square more regional, and spread the national culture to the outside is the research focus of this paper. By understanding the basic composition of the Mongolian ethnic elements, combining with the actual situation of the landscape design of Inner Mongolia city square, the deficiencies of the existing design are summarized, and the strategy of optimization design is put forward, hoping to help relevant personnel to better grasp the Mongolian ethnic elements and combine it with the landscape design of the city square.