Psychological research shows that students' interest in learning in class is directly related to the teaching effect. So how to stimulate students' interest in learning in class has become the key to the success of a class. So how to stimulate students' interest in learning in class? I think the best choice to stimulate students' interest in learning is to create a lively situation suitable for the psychological characteristics of primary school students. Only when students are willing to integrate into their own situations can they stimulate their interest in learning, and then they will take the initiative to explore, practice and develop. Below, I sum up my accumulated mathematics classroom situations in teaching practice and share them with all my friends. I. Competitive Situation A foreign educator once said: "Every possible method should be used to stimulate children's desire for knowledge and learning." Today's society is a highly competitive society, and we are in such a big environment. If we create a competitive situation in the classroom, it will not only create a stage for students to show themselves and publicize their personalities, but also cultivate their ability to adapt to society, which will certainly cultivate students' good sense of competition and promote their motivation to "compare, learn and catch up" in their study and life. For example, when teaching "addition and subtraction of fractions" and doing classroom exercises, we can take the form of group competitions between men and women. Before I announced the rules and requirements of the competition, all the students were already in the state of competition, cheering for their teams, and their interest in learning was suddenly mobilized and their enthusiasm was high.