The American College Student Mathematical Modeling Competition (MCM/ICM), sponsored by the American Federation of Mathematics and Its Applications, is the only international mathematical modeling competition. The content of the competition involves many fields such as economy, management, environment, resources, ecology, medicine and safety. The competition requires three students (undergraduates) to complete an application paper on a specified problem within four days, which can be said to be the originator of all kinds of mathematical modeling competitions today. Speaking of the word DW(DQ), all the students who have participated in the USA Tournament know that we can take the time back to the DW event of the USA Tournament in 20 19. This year can be said to be the most extraordinary year in the mathematical model session, and it is also the most severe year in the history of the higher education club cup national competition, which caused a sensation in the whole mathematical model session. Because of this, there is the American version of 20 19.