The book Mathematical Thinking Tree clearly points out that mathematics teaching is the teaching of mathematical activities, that is, the teaching of thinking activities. In other words, in mathematics teaching, students should not only master basic knowledge and skills, but also pay attention to cultivating students' thinking ability. The so-called thinking ability means that people use basic methods such as comparison, analysis, synthesis, induction and deduction to form concepts and make inferences and judgments on the basis of perceptual knowledge. At the same time, the book also explains in detail how to cultivate students' thinking ability in mathematics teaching and promote students to develop good thinking quality. After reading it, I was deeply inspired: it not only made me understand various types of mathematical thinking modes and methods, but also made me understand how to infiltrate and cultivate primary school students' mathematical thinking ability. At the same time, I also apply these theoretical knowledge in the book to the usual classroom teaching practice. Grasping psychological characteristics and stimulating innovation interest are the source of innovation and the driving force of thinking. In teaching activities, teachers should stimulate students' interest in innovation, enhance the internal driving force of students' thinking, and solve the motivation problem of students' innovative thinking. Pupils are curious and eager to learn. Teachers should grasp these psychological characteristics of students, give appropriate guidance, stimulate their thirst for knowledge and cultivate their interest in learning. For example, when the unit price was introduced, I created a Xiaoming who went to the stationery store to buy pencils, erasers and schoolbags. She didn't know how much money to bring. Can you help her calculate it? Before class, students were assigned to investigate the prices of pencils, erasers and schoolbags. In class, students answered this question with great interest. When they met "How much is each pencil, eraser and schoolbag", the unit price was naturally deduced. We should carefully design each class, make each class vivid, deliberately create moving situations, set attractive suspense, stimulate students' thinking sparks and desire for knowledge, and let students realize the important position and role of mathematics in real life. We should always guide students to explain their familiar practical problems with the mathematical knowledge and methods they have learned. As Confucius said: "The knower is not as good as the ignorant; Good people are not as happy as those who know. "As long as the problem situations created by teachers can suit students' thinking level, students' interest in learning will be high and their thinking level will be further developed.