This article analyzes the differences of Scholar [Ulama] on ushul al fiqh and their implications in the differences of furu' fiqhiyyah. Based on the theory that differences on Ushul make the differences on Furu', it is found that the differences on mazhab [school of Islamic Jurisprudence] have four causes, i.e. the common causes of differences, the qawa'id of al Qur'an and al Hadis understandin…