This study came to falls light to the role of the Commentary Scientist during the writing of the Prophet Biography. Therefore it was during the privies time those who wrote of the Prophet Biography who enough the people of Al-Magazi and Biography who the owner of the history and novels and there is no role for the others in writing the biography and it seemed that is correct for the first time but if belong to the writers who are owner of the art and will be served them which decided them without any other details during there works, showing the events of Prophet biography. Therefore this study came to rendering the role of the commentary scientists during the writing of the Prophet biography.