This academic thesis deals with the issue of methodology as used by Muṣṭafā Abdel-Rāziq (1885 - 1947). It is an issue that represents the essence of his academic philosophical thought. Muṣṭafā Abdel-Rāziq is considered one of the leading religious reformists, and he was the faithful disciple of f Muḥammad ʿAbdū, the second founder of this trend with Jamāl al- Dīn al-Afghanī. Muṣṭafā Abdel-Rāziq added a dimension of more breadth and accuracy by expanding on the contemporary range of general thought transforming it to an academic specialist thought. Abdel-Rāziq is the founder of the current academic discipline. This foundation is based primarily on his new theory about the philosophical creativity in Islamic Civilization He considered al manhaj al uṣūli or the methodology of uṣūl al fiqh a science that was always subject to classification within the religious legitimate sciences which makes it the focus of this philosophical creativity