Undoubtedly, Plato’s most fundamental philosophical foundation is the theory of Ideas; not only his ontological and epistemological discussions but also his politics, ethics and other aspects of his thoughts are directly or indirectly affected by this theory. This Platonic view has traversed a large part of the history of philosophy. Meanwhile, the author has considered Aristotle’s criticism of the theory of Ideas to be important, because first, he was a direct disciple of Plato; secondly, since he was himself a great philosopher like his teacher, his criticisms will be certainly precise. However, unfortunately, Aristotle was also exposed to the accusation of misunderstanding and even the inner affluence in explaining Plato's view on the Ideas, and that in some cases the theory of Platonic Ideas has been introduced so rude and insignificant that as if this theory has no justification. The author has tried to go through the moderation of these extremes and claimed that these philosophers be exonerated of these accusations, and as much as possible to do justice in explaining the theory of Ideas.