The semisolid slurry preparation of die steels Cr12 and Cr12MoV with high chromium content was studied.The results show that the semisolid slurry of both steels with solid of40 %-60%can be made by electromagnetic stirring method and is easy to be discharged from the bottom little hole of the stirring chamber.The sizes of the spherical primary austenite in the slurry of die steels Cr12 and Cr12MoV are 50-100μm and 80-150μm,respectively.The homogeneous temperature field and solute field for both steel melts are obtained.The strong temperature fluctuation in the melt with many fine primary austenite grains occurs and the remelting of the secondary arm roots at the same time is accelerated because of the electromagnetic stirring.These are the most important reasons for deposition of spherical primary austenite grains. The semisolid slurry preparation of die steels Cr12 and Cr12MoV with high chromium content was studied. The results show that the semisolid slurry of both steels with solid of 40% -60% can be made by electromagnetic stirring method and is easy to be discharged from the bottom little hole of the stirring chamber. These sizes of the spherical primary austenite in the slurry of die steels Cr12 and Cr12MoV are 50-100 μm and 80-150 μm, respectively. temperature fluctuation in the melt with many fine primary austenite grains occurs and the remelting of the secondary arm roots at the same time is accelerated because of the electromagnetic stirring.These are the most important reasons for deposition of spherical primary austenite grains.