The reason why chemical engineering and pharmacy recruit mathematics and applied mathematics majors is because chemical engineering and pharmacy cannot do without mathematical knowledge. Mathematics and applied mathematics majors train senior professionals who master the basic theories and methods of mathematical science, have the ability to use mathematical knowledge and solve practical problems with computers, have received preliminary training in scientific research, and can engage in research and teaching in science and technology, education and economics departments or engage in practical application, development, research and management in production, operation and management departments. Chemical industry and pharmacy need mathematical talents.