Based on the mathematical quantification principle of the relative criterion idea of discrete quantity system, this paper studies the relative characteristics of the application of the relative criterion idea, and summarizes the relative characteristics of the relative group, time and space. Relative characteristics are inherent and ubiquitous in the application of relative criterion ideas to solve problems. In solving the simple and basic problems, the relative characteristics of different conclusions from the traditional thought show that the cognitive standard of the traditional thought is not an objective standard. It is accidental to use subjective absolute standards to solve objective problems and get correct results, not inevitable. In this paper, the theoretical basis of the relative characteristics is clarified by means of the theoretical formula of the relative criterion, and the different types of relative characteristics are illustrated by three examples. In order to clarify the application method of the relative criterion formula, the calculation process is given. The idea of relative criterion makes people re recognize the importance of standards and other relativity and objectivity. The formula of relative criterion theory lays a theoretical foundation for correctly solving practical problems.