No matter how rapid the development of computer technology is, multimedia teaching is only a kind of auxiliary teaching mode, which plays an auxiliary role in the teaching and learning activities of teachers and students. And some people blindly enlarge the advantages of computer technology is one-sided and limited. The application of multi-media teaching should emphasize its assistance to teaching, so as to ensure that students develop their thinking in images and abstract thinking simultaneously, and to perfect their rational and logical reasoning abilities simultaneously, so that the computer in the classroom teaching of mathematics really reflect the "auxiliary" effect. The Multimedia Auxiliary Mathematics Teaching has its unique superiority,