Interactive teaching is a multi-directional communication between teachers and students, that is, teaching activities are regarded as sincere and harmonious communication between teachers and students, and teaching process is regarded as a dynamic process of teaching and learning. The new curriculum standard points out: "Mathematics teaching is the teaching of mathematics activities and the process of interactive development between teachers and students." In this process, through the way of "teaching interaction", harmonious teacher-student interaction and student-student interaction are formed, and the teaching mode of improving teaching effect is achieved. How to create a harmonious and interactive mathematics classroom? First, establish a democratic and harmonious relationship between teachers and students and create a learning environment of equality and mutual assistance. There should be emotional communication between teachers and students. Teachers' feelings for students will be revealed from teachers' words, behaviors and manners and will be perceived by students. Feeling students' feelings for teachers will also be shown in students' words and deeds and smiles, and will be understood by teachers. Emotional communication between teachers and students can better promote the effective interaction between teachers and students, which is an effective condition for mathematics classroom interaction. For example, when a teacher goes to school to take part in a competition, there needs to be emotional communication between teachers and students in an unfamiliar environment. Teachers and students exchange their hobbies with each other.