Kusadali Muhammed b. Hamza is one of the ottoman sclıolars who lived in llth. century. He didn't write many books but he became a fariıous scholar especially· he is known by his book named Netaicu'lefkar. This book is one of the sharhs written on Imam Birgivi's(981/1573) Izharu'l-esrar. Netaicu'l-efkar got very important place in teaching syntax of Arabic language. But it criticized by other scholars from different aspects and this sametimes let to written other sharhs on Izharu'l-esrar.