Among the theological methods (textualism, interpretive rationalism and philosophical rationalism), Khwaja Nasiruddin Tousi should be considered subject to the philosophical rationalism method and although before him, other people also used philosophical foundations to prove theological claims, but due to They went to extremes or used it polemically; As these foundations did not have a special order. But Khwaja Naseer took the path of moderation and, while being bound by the proof method, used the philosophical foundations in a systematic and organized manner in theology; Because before Khwaja Nasir, the science of Kalam, even among the Shias, did not have a clear order and a logical arrangement. He was able to bring the word to the peak of development and evolution with his comprehensive and to some extent new and innovative arrangement and using philosophical principles and rules, and after that, most of the Shia and Sunni Islamic scholars followed his style.