Middle school mathematics principles and methods series *** 10 books. The series "Principles and Methods of Middle School Mathematics" is a set of teaching materials suitable for students' autonomous learning. The textbook writer carefully selected the typical examples of each chapter, added two sections: "analysis" and "popularization", and gave the detailed problem-solving process of each example. "Analysis" is to remind students what kind of thinking methods and problem-solving strategies can be adopted from the perspective of solving this problem. And "promotion" is to help students find general methods to solve similar problems from the perspective of problem-solving reflection and summary promotion, and strive to achieve the goal of bypassing analogy and unifying multiple problems. I believe that the design of these details will benefit students greatly when reading textbooks. In the arrangement of teaching materials, this series of books carefully sorts out the specific contents of six-year mathematics in junior high school and senior high school, and integrates them into corresponding unit modules according to the order of the occurrence and development of different knowledge to guide students to learn mathematics according to different modules.