Category is one of the bases of knowing the world for human beings, and it is a preliminary concept in cognition process. The research of categorization began from Aristotle’s classical category theory to Wittgenstein’s modern category theory, that is, prototypical category theory. There are many differences between the classical category theory and modern category theory: According to the former, category is objective, the category members depend on a group of sufficient and necessary condition, and category boundary is definite; according to the later, category correlates with experience, the status of category members are different, and the category boundary is indefinite. Through comparing the two category theories, we can see clearly that the modern category theory is closer to our cognition, and more scientific and explainable; and has been widely applied in both verbal and nonverbal areas. However, they are complementary in some certain aspects and both are used in the process of categorization in our life.