Like fiqh, qowaid fiqhiyah has developed for many years to be as an independent knowledge. The form of Islamic law form [qowaid fiqhiyah] varies and tends to affiliate to certain way [mazhab]. Thus, it is necessary to study in its history. In this case, there is a misunderstanding among experts about the unforbidden of doing ilhaq toward Islamic law form. Al Nadwi has two perspectives: in one s…