Select China taught A high school math teaching material with book research mathematics textbook edition of the "plural" content as the research object, from chapter theme page, knowledge structure, column. The results show that there is a close connection between old and new knowledge in the theme page of the textbook chapter, the column design structure is rich, the basic knowledge is emphasized and the content distribution is focused, and the difficulty of example exercises is relatively low. The theme page of the chapter focuses on the introduction of mathematical history, the column design is simple, the content of knowledge expansion is extensive and comprehensive, and the comprehensive difficulty of examples and exercises is high. On this basis, we get some enlightenment on the compilation of complex content in Chinese textbooks.