The following suggestions could be used as a reference for mathematics extra-cursory books suitable for junior high school students: "Math Paradise"(a must-read for math competition coaches): Through interesting examples and puzzles, it introduced the basic knowledge and applications of elementary mathematics. It is suitable for junior high school students. 2. The Charm of Mathematics (written by the famous mathematician Shiing-Shen Chern in prison): It tells the story of Shiing-Shen Chern's mathematics career in the form of a novel and deeply probes into the essence and charm of mathematics. It is suitable for junior high school students to read. 3."The Wonderful Mathematical World"(written by the mathematics genius Hawking): Hawking used the form of a novel to describe mathematics, black holes, the universe and other topics suitable for junior high school students to read and improve their interest in mathematics and science. The Story of Mathematics (by Professor Lee Tsung-Dao): Lee Tsung-Dao narrates mathematics, philosophy, life and other topics in the form of a novel. It is suitable for junior high school students to read and improve their understanding of mathematics and philosophy. The above books are suitable for junior high school students to read and help them expand their mathematical knowledge and improve their mathematical literacy.