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Avicenna in two parts of the book of Al-Shifa (کتاب الشفاء) or The Book of Healing reports the theory of Platonic Ideas or Forms: first account is in the chapter 10 from the second book in the Demonstration Treatise (رسالة البرهان) and second account is in the chapter 2 from the seventh book in the Theology Treatise (رسالة الالهیّات). Both reports have explanations of the theory of Platonic Ideas and then some critiques of the theory. Here we will discuss only Avicenna's description and explanations of the theory of Ideas; what is Avicenna's understanding from Plato's Ideas? At the present essay it is necessary to investigate the range of familiarity that Avicenna has with Platonic Ideas, Aristotle's role in this familiarity and the philosophical functions of the Ideas in Avicenna's understanding and identification of them. First of all, Avicenna thinks that Platonic Ideas are universals and, on this description, he erects other descriptions of their truth. It is vital to know that Avicenna's familiarity with Platonic Forms is essentially mediate; that's by way of Aristotle's works including both descriptions and criticisms of those forms. Review and analysis of Avicenna's texts brings us to the three arguments of Platonists for the existence of Ideas: the argument from the sciences, the one over many arguments and the object of thought argument.