The Primary School Olympic Mathematics Reader is a series of books with the following characteristics: 1. Low starting point. This series of books is appropriately extended from the relevant knowledge of mathematics textbooks of all grades. The content concern is related to the mathematics textbook of nine-year compulsory education, which is really close to the purpose of compulsory education. Second, the content arrangement is stepped and distinct. Thirdly, unlike most writing methods in the market that only pay attention to solving problems and ignore the idea of type problem solving, before each type, outline the idea first, then put forward methods in specific problem solving and give directions in difficult problems. Fourth, the combination of speaking and practicing. The arranged training exercises are closely combined with examples to explain the main points and pay attention to the same knowledge point from multiple angles, which not only ensures the intensive reading of new knowledge, but also expands students' thinking.