The National College Student Modeling Competition is a mathematical expression of practical problems. 3D modeling may not be used. Specifically, a mathematical model is an abstract and simplified mathematical structure of some real worlds for a certain purpose. More precisely, a mathematical model is a mathematical structure obtained by simplifying some necessary assumptions and using appropriate mathematical tools according to its unique internal laws for specific objects and specific goals. Mathematical structures can be mathematical formulas, algorithms, tables, charts, etc. Mathematical modeling is to establish a mathematical model, and the process of establishing a mathematical model is the process of mathematical modeling (see the flow chart of mathematical modeling process). Mathematical modeling is a mathematical thinking method, and it is a powerful mathematical means to describe and "solve" practical problems by using mathematical language and methods through abstraction and simplification.