In scientific research，model is an important bridge to understand and explain the objects of study. Model, as the research object, is the result of “mathematical projection” and it is bound to be simple and approximate. The different forms and sophistication degree of Models show different stages of development in scientific research. With the development of science and technology, science models have evolved from being physical to conceptualized, theoretical to mathematical, qualitative to quantitative, and computer simulation to reality simulation, which means a gradual development from concrete to abstract, but finally returned to concrete from the high level of abstraction. This process reflects the essential requirements of visualization nature of human thinking.