Precision high pressure die casting (HPDC) for non-ferrous casting applications is increasingly used in the foundries. In industrial production, optimization dieing process parameters and to achieve quality and improve HPDC products, has always been a matter of concern and challenge for manufacturers of HPDC products. Porosity is one of the most common defects in aluminum high pressure die casting, and porosity formation is closely related to the die casting process parameters. In this study, the approach is used experimental research to optimize the die casting process parameters for aluminum alloy AlSi9Cu3 with the goal of reducing porosity in pressure casting processes, in order to achieve high quality of casting products. Therefore, in order to minimize porosity, this paper studies the influence of process parameters on porosity formation in HPDC of AlSi9Cu3 alloy, and optimization of the process parameters is performed using the Taguchi parametric design approach.