Abstract: The remelting temperature field of semi-solid A356 alloy was simulated using ANSYS software. The result showed that the current density of coil is inversely proportional to heating time and directly proportional to the temperature difference between specimen's inside and outside. The appropriate current density is 0.5 × 10⁷ A/m² and 0.6 × 10⁷ A/m² when the cross-sectional area of the coil used is 40 mm × 130 mm, and the temperature difference is 8.6°C and 9.8°C with heating time 31 min and 21 min, respectively. The appropriate current density is 0.80 × 10⁷ A/m² and 0.85 × 10⁷ A/m² when the cross-sectional area of the coil used is 20 mm × 130 mm, and the temperature difference is 8.7°C and 9.0°C with heating time 33 min and 30 min, respectively. The simulation provides theoretically a guidance for the industrial practice of semi-solid of A356 alloy.