Deep narrow groove structure has the characteristics of small size,large depth to width ratio,small processing area has poor chip discharge,poor heat dissipation effect and other problems.In order to solve the difficulty of chip removal during machining deep narrow grooves,an optimized electrode structure was proposed to improve the compound machining stability of deep narrow grooves.Three tubular electrode structures of single-hole electrode,porous electrode and spiral electrode were designed,and the state of gap flow field during machining with different electrode structures was simulated.The distributions of the velocity and pressure of the inter-electrode medium under different electrode structures were compared,and the simulation results were verified by experiments.The machining efficiency,dimensional accuracy,surface quality and other indicators were used to explore the effect of electrode structure on the short electric arc and electrochemistry compound machining performance.The experimental results show that the spiral electrode structure can improve the flow field state compared with the single-hole electrode and porous electrode,and enhance the machining efficiency and surface quality with ensuring the dimensional accuracy of the deep narrow grooves.