This is all caused by lack of interest in mathematics. Therefore, how to improve students' interest in learning is very important. Without interest, even if they are forced to study every day, the effect is not good, but it is counterproductive. Next, I will talk about my own ideas on how to improve students' interest in learning mathematics. The age of junior high school students in the pre-class stage of 1 determines their physiological and psychological characteristics of emotional instability, persistent hobbies and inability to concentrate for a long time. In order to keep junior high school students' enthusiasm and initiative in learning mathematics for a long time and make students have a long-term strong interest in learning mathematics in class, teachers should pay full attention to the lead-in link before each math class in the process of mathematics teaching. A good beginning is half the battle. Teachers can stimulate students' interest in learning at the beginning of the class, which can be described as getting twice the result with half the effort. So the introduction before class is very important. Teachers should design the introduction method according to the different knowledge, emphasis and difficulty of each class, so as to avoid students losing interest in this class as soon as the class starts. Classroom teaching time above the classroom accounts for a large proportion of the whole classroom. Teachers should grasp it well and try to cultivate students' interest while teaching students knowledge. For example, in class, we can tell some short stories and episodes about the topic in time to create a relaxed learning atmosphere and increase students' curiosity about mathematics. Teachers should be passionate, loud and have a sense of humor, so that students will not feel bored in math class. 3 After-class guidance Because the cultivation of students' interest is not achieved overnight and there is little extracurricular time, teachers can give guidance in extracurricular activities and hold activities on mathematics once a week to strengthen students' interest in activities. When learning Pythagorean Theorem of Right Triangle, in order to strengthen students' understanding of Pythagorean Theorem, on the one hand, teachers can start with the introduction before class, on the other hand, they can carry out activities after class to deepen students' understanding and practice of Pythagorean Theorem. There are many optional items. For example, you can choose to make your own pyramids and design and calculate the height, width and other data yourself. This can not only improve students' interest in mathematics learning, but also improve their practical ability. You can kill two birds with one stone. Why not? In addition, teachers should strengthen their self-cultivation, talk humorously, and have more contact with students after class, so that students feel close to you, which is also helpful to their own subjects. Be good at guiding and inspiring students. In addition, some skills can be used in class, such as setting traps, which can deliberately deceive students. Teachers can also learn from each other, strengthen their self-cultivation, enrich their knowledge, and will not be stumped by students sometimes, so that students can have a sense of admiration for themselves and help them learn their own subjects.