“Quadrilaterals” is an important branch of mathematics in junior middle school. This study used qualitative and quantitative research methods to analyze and compare the “Quadrilaterals” content in Chinese and American Mathematics Textbooks from the macro layout structure design and micro content difficulty. It is concluded that the arrangement order of “Quadrilaterals” chapters in the three editions of textbooks is basically the same, the GMH version has a wide range of content, while the BNUP version has a low depth of content. The discuss of this study are as follows: properly add the expansion chapters of teaching materials, appropriately enrich the teaching introduction links, optimize the course structure and tap the beauty of mathematics.