Mutezile comes to mind when ‘rationalism’ in the history of Islamic Theology is in question. However, the method that put forward how to use the ration properly has been produced by al-Maturidi and his fellows. Unfortunately, the works of al-Maturidi have been started to be published in the beginning of twentieth. The ration is both the source of knowledge and the power that separates one thing from anothers in al-Maturidiyya. The ration is separated into two pieces as natural and an acquired ration by Islamic theologists. The acquired ration is open to improvement every time according to them. Islamic Theology known as al-Maturidiyya founded a strong stability between the reason and the revelation. In this connection, ration cannot live surely without revelation. In the same way, revelation has not importance without reason. Because, the revelation is understood by means of the reason. The revelation speaks to people who have the ration. Consequently, transformations between the ration and the revelation according to the nature of subject can be occurred for grasping the meaning of the religion properly. For instance, the ration can be prime in some situations. On the other hand, the revelation can be subordinated in other situations. But this can sometimes be full reverse and it might be found the samples of this situation in the books on the Islamic Theology.