The main lines of geometry, algebra and function in the new high school mathematics textbooks can cultivate and enhance the core literacy of mathematics. Mathematics textbooks for ordinary senior high schools design an overall logical framework around four main lines: function, geometry and algebra, statistics and probability, mathematical modeling activities and mathematical inquiry activities, and construct the basic structure of the textbooks. Based on students' development, cultivate and improve students' mathematical core literacy. Follow the teaching rules, pay attention to the scientific, rigorous and ideological nature of the teaching materials, and make the teaching materials convenient for teaching. Follow students' cognitive rules, pay attention to the readability and exploration of teaching materials, and let students learn. Enhance the flexibility of teaching materials through colorful column design.