The composite materials are widely used in many industries and are very difficult to machine the metal matrix composite by conventional machining methods. Hence unconventional machining techniques are used to machine the materials. Wire Electrical discharge machining (WEDM) gives larger capability for cutting complex shapes with high precision for composite materials. In this present work, the effect of a process parameter of Wire Electrical discharge machinings such as Voltage, Pulse on- time, pulse -off time and current were studied for the reinforced metal matrix composite composites. Aluminum 7075 reinforced with Silicon carbide are fabricated using stir casting process and machining was done in WEDM using the design of experiments approach. The material removal rate for the different set of experiments was studied. The influence of weight fraction of reinforcement on metal removal rate was discussed.