Abstract: To address the mechanical property deficiency caused by the coarse primary silicon phase of hypereutectic aluminum-silicon alloys, this study combines the characteristics of semi-solid forming technology and proposes a “electromagnetic stirring and heat treatment” synergistic strengthening process. The regulation effect is explored through an orthogonal comparative test system. The results of the system characterization test show that under the optimal parameter combination (50 V stirring voltage, 15 Hz stirring frequency, 30 min stirring time, combined with 515 ℃×6 h solution +120 ℃×8 h aging), the primary silicon phase of the alloy is significantly refined into fine and round granular form. The tensile strength reaches (289.4±10.5) MPa, the elongation reaches (18.4%±0.6%), and the hardness reaches (62.3±4.2)HV. This process achieves the coordinated optimization of the uniformity of alloy structure and mechanical properties,meeting the manufacturing requirements of wear-resistant parts such as automotive engine pistons. It provides a reliable technical reference for the high performance of aluminum-silicon alloys and has a promising prospect for engineering promotion.