With the transition to the new government system, executive order has become an important instrument of legal regulation in terms of its nature and scope. The distinction between executive order and presidential decree, also issued by the President, appears to be an essential topic both in theory and in practice. In this article it was mainly put forth whether there is quality difference between abovementioned decrees or not, to where their boundaries of the regulation or establishment areas extend and to which direction the legal consequences resulting from this typical difference move. Within the framework of the literature review was revealed that one of the most important aspects which differentiated the executive order from the presidential decree is stemming from being primary or secondary. That is, while executive order is originated directly from the Constitution, on the other hand presidential decree can be put into force only based on and scope of laws. Moreover, another aspect of executive order that distinguishes it from presidential decree was pointed out as general or singular characteristics of the action. Contrary to singular character of presidential decree, executive order was put in the Constitution as general, abstract and objective regulations. After revealing this typical difference between executive order and presidential decree as above; their regulation or establishment areas, judicial reviews and obligation to publish in the Official Journal were the other important issues addressed in our article.