The issue of being as the best order has always attracted the attention of many thinkers and Islamic philosophers and theologians in particular. Moreover, for a long time, there have been several extensive discussions in this regard between two groups of thinkers: those who deny it, and those who agree with it. This subject is also the center of attention today considering man's philosophical and scientific growth concerning the complicated and accurate order of the world of being. The discussion of the best order, on the one hand, depends on the knowledge, wisdom, and purpose beyond divine acts and, on the other, can be a response to the ambiguities regarding the defects and evils that we observe in the world of being. Therefore, research in this respect can play an essential role in the growth and promotion of religious knowledge and a rational view of religion. Moreover, the necessity of believing in divine perfection, knowledge, and power pushes rational and religious defenders to respond to the various questions which are posed concerning the existence of evils, defects, and shortcomings of the system of creation relying on rational and philosophical principles, as well as clarify and demonstrate the philosophical and the best order of creation and the justness of the order of being and Shari ' ah by means of rational arguments.The writer of this paper, through a study of the concept of "the best order", has paid attention to the necessity and background of propounding this discussion in philosophy, explained Mulla Sadra's view in this regard, and examined the reasons of those who are for and against this theory. This is because this issue is of great importance from both theological and religious aspects and can also have certain functions in the consolidation of the theoretical bases of Islamic theology as a completely philosophical issue. Besides, it can be of great significance in important theological discussions regarding such topics as the evils, teleological nature of divine acts, the argument of order and cosmology, and the knowledge, power, and wisdom of Almighty Truth. Accordingly, the writer has tried to clarify this issue and pose its philosophical design and basis. In doing so, he has developed and presented some ten reasons and, finally, criticized and examined some of the ambiguities concerning the issue of “the best order”.