<strong>ملخص الدراسة:</strong>

The study with all its several axes aims at finding the effect of the grammarian Ibn Hisham via emerging his critical effort towards the grammarians. All the researchers recognize the effect of Ibn Hisham on the course of the4 grammatical study and its development via the considerable grammatical heritage left by him, and the unique grammatical value of this heritage in examining the grammarians' attitudes and their points of view and distinguishing the proved attitude from the weak.Ibn Asfour is considered one of the great grammarians studied by Ibn Hisham critically and widely in his books. He preferred many times to criticize Ibn Hisham. He may criticize him for a false opinion which was not of his literary school. Even he may criticize him for Ibn Hayyan's pursuing Ibn Asfour in his criticism. This is what our study attempts to study in detail.