The purpose of this paper is to survey the relationship between economics and ethics in the history of economic thought. So the descriptive methodology of research is applied to find study and analyze the references which have been written about the matter. The conclusion shows that economics not only hasn’t been detached from ethics, but also has been the subdirectory of ethics in the beginning. In the other word economics grew out of moral philosophy and eventually became one of the moral sciences but these two sciences detached from each other as times go on, and this detachment is not part of the tradition of economics.