This study examines how process parameters -Current (Amp), Pulse on time (Ton), Duty cycle, and voltage ( v) affects the surface finish of the hybrid aluminum composite (Al6061/SiC/Graphite), comparing the effectiveness of cryogenic treatment on the EDM tool with a non-treated tool. One factor at a time (OFAT) approach shows that increasing current from 4 A to 12 A raises surface roughness from 0.2 µm to 2.5 µm. However, using silicon carbide, cryogenically treated electrodes, and longer pulse-on times can reduce roughness, though debris removal may be needed. Higher voltages above 120 V also increase roughness, which can be lessened by better flushing and cryogenic treatment. Lower duty cycles (0.36 to 0.48) yield smoother surfaces, while medium duty cycles (0.6 to 0.72) increase roughness, which can also be mitigated by cryogenic treatment.