Even though Ancient Greek philosophy combined truth with art so as to “save the phenomena”, philosophers treated art narrowly and regarded “truth” as the only yardstick. Consequently, the essential issue of aesthetics that how people establish the truthfulness of art in terms of ontology arose. Thought to the truthfulness of art was initially carried out in three aspects. First is the battle between “poetry” and “philosophy”; the second is whether “crafts” could be an approach to knowing truth; third is the conflict between the mythos and the logos. The mythos uncovered by Plato has laid the foundation for unfolding and deepening the truthfulness of art for the following two thousand years, thus preparing the ground for the truthfulness of art in terms of epistemology.