Abstract
This paper tries to show that ontology is one of the important tendencies in the future philosophy. The author thinks that ontology as the basic spirit makes philosophy be different from other subjects. Ontology originates from people’s examination to essence of the world. However, ancient long-term argument couldn’t get any clear conclusion. So philosophers gradually understand that ontology is connected with epistemology. If we want to make a good explanation to ontology, we must return to check ourselves cognition. And the epistemology turns into the main stream of the philosophy Since Descartes. But this doesn’t mean ontology being disappeared. It only tends from the stage to background. In fact, the discussion of the linguistic philosophy still belongs to epistemology. As a whole, we can say philosophy really goes though one negative development. According to dialectic, negation of negation is a universal law. The philosophy has to undergo another inevasible reform and return to ontology again. Many contemporary philosophers have regarded this and begin to do it effectively.