The basic forms of thinking in images are imagination and expression. Representation is an imaginary image formed in the mind of the phenomenon that has been recognized and felt in the past. It can express reality with the help of intuitive and vivid images, and it is also instructive. Without appearances, you can't think in images. Mathematics knowledge is abstract. Teachers should try to "materialize" the abstract mathematics knowledge in teaching, so that students can know it intuitively, feel it physically and operate it practically. The imaginary image formed in their minds can promote students' active learning. Therefore, teachers should base themselves on students' real life, use various visual teaching AIDS, pictures and exercises, so that students can obtain objective, comprehensive and colorful representations and improve their thinking ability in images. For example, in the process of teaching "circle understanding", teachers can show real-life round objects in advance, such as a globe, a basketball, a football, a bottle cap and so on. And ask students to list round objects in life, such as cups, bowls, table tennis, golf balls, etc. With the help of real perception of real objects in life, students can have an intuitive image of circular objects. On the basis of initial cognition, teachers guide students to observe the circular teaching model carefully. Compared with textbooks, the circle is a special form of ellipse. When the eccentricity of the ellipse itself is equal to 0, the two focal points will overlap to form a circle. And find out the overlap of the two teaching modes, combine the physics teaching mode with textbook knowledge, and integrate theory with practice. Through this way of learning, students can actively think, actively participate in practical operation, construct clear representations in learning, and make their thinking tend to be rational. In addition, we can make full use of modern multimedia courseware in teaching, combined with the development trend of dynamic video audio-visual display thinking, which can improve students' learning initiative and improve teaching efficiency and quality.