ABSTRACT This paper will give an accurate definition and the most fundamental characteristics of philosophy, and analysis of people's past misunderstanding of philosophy. The definition of philosophy is the most abstract rational idea or theory. The characteristic of philosophy can be summed up in three words: fake, large, and empty. The building on the drawing is a fake one. The better the fake products are made, the better the real building will be. Matter is true, consciousness is fake. Compared with scientific concepts, philosophical concepts and theories have larger extension, even covering the whole universe and all aspects of things. Philosophy is the most abstract theory, so the concepts of philosophy have the emptiest connotation. The reason why the specific natural and social sciences need the support of philosophy is precisely because philosophy has this kind of characteristics of fake, large and empty. The philosophers study all problems in the hope of finding the root cause of all problems, that is, the Origin. Later, it is found that it is impossible to solve all problems in one way. To solve problems, we can only analyze them on a case-by-case basis. Philosophers are too wise to be wise. In the eyes of ancient Greek philosophers, philosophy should be the most holy, most supreme, most virtuous, wisest, most advanced, most rational, most capable, most complete and most refined knowledge. But the it is proved that this kind of philosophy does not exist at all. But the characteristic of philosophy of being the largest is not an illusion. The division of something into several aspects is neither in terms of spatial relations nor temporal relations, but in terms of different feelings. The large extension of philosophical research is not only reflected in the study of the space and time of whole universe, but also reflected in the study of all aspects of the various dimensions, covering all disciplines. The fourth manifestation of the largeness of philosophy is the depth of microscopic exploration. The fifth is the attention to the complexity and order of the system. The sixth is the understanding of consciousness. The seventh and the most important manifestation is to look at oneself. Philosophy offers the most rational view of the world.
Key Words: Philosophy; Ontology; Abstract; Extension; Consciousness; Rational