In this paper experiments were conducted Al- Si alloy plate. Mentioned alloy has growing range of applications in aerospace and automobile sectors. Scope of Al-Si plate is significant in various industries but it is very difficult to machine. This paper shows experimental work carried out on Al-Si alloy varying various process parameters like current, discharge current, pulse on time, etc. | Experimental investigation of various process parameters of powder mixed electro discharge machining process for machining of Al- si alloy