Considering the importance of acknowledgement of God’s power at Islamic philosophy, this article tries to answer some basic questions in this field from viewpoint of Sadr-ol-Motaallehin:1- Where does power stands among attributes of God? Is it of action or essence attributes?2- How is the relation of power to other God’s beauty attributes?3- How should one interprets power of God that it doesn’t result in similarity or literal commonness in conception of power in God and in human being.4- What are peculiarities of omnipotence? And what distinguishes it from human power?5- Omnipotence, in other words, prevailing of God’s power on all creatures due to his endless mercy:Firstly, How justifies evils perceived in the world?Secondly, How justifies human’s free will and his ethical evils?