When electrical melting and explosion processing technology is used to process special-shaped deep holes with large aspect ratio,the surface quality and electrode loss are the main factors that affect the processing effect.The self-developed special-shaped deep hole machining electrode was used to study the influence of process parameters such as peak current,power supply voltage,electrode material,coolant pressure and other process parameters on the surface quality and electrode loss in the process of large aspect ratio special-shaped deep hole processing through single factor experiment method;the primary and secondary order of influencing factors on machined surface quality and the optimal combination of process parameters were determined through orthogonal test.The results show that when the electrode material is copper-tungsten alloy,the peak current is 120 A,the power supply voltage is 21 V,and the coolant pressure is 6 MPa,which is the best combination of process parameters.The research results provide reference for the parameters selection in the actual machining of special-shaped deep holes through electrical melting and explosion.