The increasing demands of machining of complex shape geometries and their high surface finish and has further strengthened the need for non-traditional machining processes. Among various process, EDM has been explored to a large extent owing to surface finish and MRR are of crucial importance in the field of machining processes. Taguchi’s optimization technique, in order to optimize the cutting parameters in EDM for superalloys. The objective of the effect of EDM parameters on MRR, Surface finish for machining NIMONIC75 alloy. In this present study, superalloy is used as a workpiece, copper or copper Alloy Like Brass used as a tool and distilled water is used as a dielectric fluid For experimentation, Taguchi’s orthogonal array will be followed by ANOVA to identify the most significant factor. This would follow by developing an empirical relation and optimization study. Nimonic75 (Nickel chromium base Alloys) is the most commonly used alloy. His basic chemical composition is Ni,Cr,Ti,C,Si,Cu,Fe,andMn. Nimonic75 is significantly strong than other commercially pure nimonic whilst still retaining the same stiffness and thermal properties. Nimonic75 extensively used in Gas-turbine engines Heat-treating equipment and fixtures Nuclear engineering aerospace,medical,marine and chemical processing.