The research revolves around the moral values in the Twelver s Shiite Islamic thought , which we can touch a tendency to rational thinking imprinted in this thought in general , and for the subject of ethics in particular, when acknowledge that deeds have their self-values, despite of the Islamic view, and that the mind can grasp them, and can judge on the deed whether its good , which it will be praised , or bad, which it will be condemn. Since the research focuses on the metaphysical foundations of ethics for a religious thought, we must go back to the origins of belief which it is based on, and they are five: monotheism, justice, prophethood, imamate, resurrection day, and the disclosure of their contents and ethical implications.