The junior students are curious and active. Their thinking is mainly concrete images, but their abstract logical thinking is weak, and they are interested in concrete objects, teaching AIDS and learning tools. Therefore, in teaching, it is an important guarantee to guide students to start work, move their mouths, move their eyes and use their brains, and let them effectively participate in the learning process. Students are the masters of learning and participants in teaching activities. Classroom teaching should be the activity of teachers and students. In teaching, we should guide students to understand new concepts with old concepts, solve new problems with what they have learned and promote students' development.