In this study, an extrusion simulation of a porthole dies for standard box profile was investigated with the support of HyperXtrude Inspire Extrude Metal 2019 software, which is specialized for FEM calculations of the extrusion process. Aluminum AA6063 material was used for simulations, the process temperature was 450°C and punch velocity was selected as 5 mm/sec. The die design was obtained according to the shape of the bridges of the porthole die. Finally, the design optimization was achieved by analyzing FEM results. It was obtained that the dies which have curved bridges offer optimum process conditions.