This study investigated the effect of EMS(electromagnetic stirring) process on tensile, wear and high-cycle fatigue properties of extruded hypo & hyper-eutectic Al-Si alloys. The material used in this study was extruded at a ratio of 17.7 : 1 through extrusion process. To identify the effect of heat treatment, T6 heat treatment (515℃/1hr, water quenching, and then 175℃/10hrs) was performed. Microstructural of Hypo-eutectic Al-Si observation identified eutectic Si phases aligned in the extrusion direction, and hyper-eutectic Al-Si observation identified primary Si phases. Both alloys were composed of Al matrix, Si, Al2Cu, Al3Ni and Al6(Mn,Fe) phases. Tensile results of hypo-eutectic Al-Si confirmed that yield strength increased from 119 MPa to 329 MPa, ultimate tensile strength increased from 226.8 MPa to 391.4 MPa, and elongation decreased from 16.1 % to 5 % as T6 heat-treatment was applied. High cycle fatigue results represented F(non heat-treatment) alloy’s fatigue limit as 180 MPa and T6 alloy’s fatigue limit as 280 MPa. T6 alloy’s scratch(wear) property was batter than that of F alloy, because T6 alloy has higher adhesion between Al matrix and eutectic Si. We also compared hyper-eutectic Al-Si alloys with addition of different grain refiners(CuP & TiO2). Tensile results of hyper-eutectic Al-Si confirmed that yield strength increased from 370.5 MPa(CuP) to 391.3 MPa(TiO2), ultimate tensile strength increased from 413.5 MPa(CuP) to 429.8 MPa(TiO2), and the elongation increased from 3.11 % to 3.32 %. High-cycle fatigue results represented CuP alloy’s fatigue limit as 130 MPa and TiO2 alloy’s fatigue limit as 130 MPa, indicating that high-cycle fatigue properties were similar. Wear results represented TiO2 alloy has an excellent wear properties than that of CuP alloy. Based on tensile, wear and fatigue fracture surface analysis, this study also discussed the deformation behaviors of EMS processing Al-Si alloys in relation to their microstructures.