Modeling is a good way to solve the reality question. In order to describe the matter of the real system, many models were designed to make deep research. In many models, there is always an idea that characterizes the main line of mathematics. With the main line, the models were derived to rules or regulations complied with the real systems. By the rules, the data processing can be handled by all kinds of algorithms and software or platforms so that they can be processed like a assembly line. By the modeling, many real systems can be demonstrated with visual and vivid methods so that everyone can understand or use. Numerical simulation also a popular way to set up or verify the models complied with mathematical methods.