The dissertation contains - in addition to the introduction and the conclusion- two sections:- The study and the investigation. In the introduction, the researcher spoke about the status of the author and the book's value. He mentioned the reasons for the investigation , the scientific editing of the book, the division of the work into two sections and the difficulties encountered. The first section is in two chapters. Chapter one is about the book's author; including his birth and growth, his efforts in the religion and islamic sciences, his Jihad, his status in the biography of Imam Azan Biri Qais and his death mystery. Chapter two includes Makalid Al Tasrif book, explanation of the title, assuring the author, the reason of writing the book, a brief summary about the explained poem, the book's contents, the author's philosophy in putting the book, the sources, the author's belief in grammar, his opinion about other scholars, the reasons for investigating the printed book stating the copies the researcher used. Moreover, the explanation of the researcher's philosophy in investigating section one of the book which is about actions and their inflection. The second part of the work is the researcher's investigation, concluded by the holy Quran verses indexes, the prophet's sayings, poems, linguistic terms, people, tribes and places, books mentioned in the book, sources and resources and the researcher scientific way in editung the book. Finally, the study summary includes the researcher's recommendations as seen by him