The general trend of modern medicine is from qualitative research to quantitative research, that is, to effectively explore the regularity of the quantity and the relationship between quantities of substances in the medical field and promote medicine to break through the shackles of narrow experience. It is developing in a quantitative, accurate, calculable, predictable and controllable direction, and has gradually derived frontier disciplines such as biomedical engineering, quantitative genetics, pharmacokinetics, quantitative diagnostics, quantitative therapeutics and quantitative physiology? At the same time, traditional disciplines such as preventive medicine, basic medicine and clinical medicine are also trying to use mathematical theories and methods to establish mathematical models and explore their quantitative laws. And these all need mathematical knowledge. Mathematical models can help biologists isolate some variables, predict the results of future experiments or infer that they cannot.