Electrical discharge machining (EDM) is one of the important non-traditional machining processes and it is widely accepted as a standard machining process in the manufacture of forming tools to produce moulds and dies. Since its introduction to manufacturing industry in late 1940s,EDM became a well-known machining method. The method is based on removing material from a work piece by means of a series of repeated electrical discharges, produced by electric pulse generators at short intervals, between an electrode (tool) and a part being machined in dielectric fluid medium. in the present study, the performance parameters of EDM process are to be evaluated to achieve the feasibility in machining of H13 tool steel it has wide application in the Hot punches and dies for blanking, forging, swaging and bending, Nozzles for aluminium, tin and lead die casting, Hot extrusion dies for aluminium, cores ejector pins, inserts, Hot shear blades. here the machining is done by EDM using three different electrode like copper, brass and bronze and investigate which type of electrode give better result for increasing MRR, and decrease SR. The experiments planned, conducted and analyzed using Response surface methodology and it is found that the MRR and SR is mainly influenced by which EDM machining parameter.