This research aims to show the meaning of "the philosophical system" and the recognition its structure, and explaining it. Because of the scarcity of such studies, especially in Arabic, beside the unavailability of the references related to the subject, we are going to study the theoretical problem about the concept of "system" in the Arabic thought, and to distinguish between the "system" and the "doctrine", trying to define the "philosophical system" and to clarify it's characters.