Discrete structure and discrete mathematics are two different concepts, which have different applications and importance in mathematics and computer science. The following are their differences: discrete structure: discrete structure refers to transforming a continuous function or variable into a series of discrete points to adapt to the processing power of the computer. Discrete structures are widely used in image processing, signal processing and digital communication. Discrete mathematics Discrete mathematics is a mathematical discipline that studies the structure and relationship of discrete quantities, and it is an important branch of modern mathematics. The research fields of discrete mathematics include algebraic structure, logic, combinatorial mathematics and so on, which are widely used in computer science, communication engineering, mathematical modeling, artificial intelligence and other fields. To sum up, although both discrete structure and discrete mathematics involve discrete variables and functions, their application fields and methodologies are different. Discrete structure is mainly used to deal with continuous functions or variables, while discrete mathematics is used to solve discrete problems. By studying discrete mathematics, we can improve abstract thinking and strict logical reasoning ability, and lay a solid foundation for participating in innovative research and development.