Abstract: In order to improve the machining speed and electrode wear caused by the poor discharge of machining debris in the process of EDM deep hole machining, three kinds of special-shaped electrodes with spiral, three grooves and edge cutting were prepared. Under the same processing conditions, aluminum-based silicon carbide was used as the experimental material, and special-shaped electrode and cylindrical electrode were used to carry out deep hole processing experiments at different depths. The processing efficiency, electrode loss and deep hole processing quality were compared and analyzed. The experimental results show that the special-shaped electrode is superior to the cylindrical electrode in the processing efficiency and electrode loss of the deep hole; in the surface quality of the hole, the deep hole after the edge cutting electrode processing is in the shape of waist drum, there are many debris on the surface of the hole after the cylindrical electrode processing.