Abstract: The problem of the current research has been represented by the lack of studies on the foundations of forming the proportional relations in the Islamic architecture. The objective of the study was defined in an attempt to reveal the concepts and the items of the system of proportional relations in the Islamic architecture. The proportion in architecture either derived from the mathematical matrix or other disciplines are always concerned on the spatial system through measurement and form’s relations. The obtained conclusions show the authenticity of the system of proportional relations in the Islamic architecture which was based on two factors, the aesthetic sense related to the symbolic aesthetic systems and the acquired knowledge related to the mathematical geometrical systems of Muslims. Hence, the Islamic architecture compositions are correlated even though the functional types and the architectural styles of its architectural models are differentiated by a unified view of the constructs underlying the proportional relations system.