The preparation of nondendritic semisolid slurry for stainless steel 1Cr18Ni9Ti was studied.The experiments show that when stirred for 2-3 min under the test condition,the semisolid slurry with solid of about 50 % and spherical primary austenite in size of 100-200μm can be obtained,and besides the slurry is easy to flow out through the bottom hole of the stirring chamber.More homogeneous temperature fields and solute fields of stainless steel1Cr18Ni9Ti melt appear because of the electromagnetic stirring,which restrains the formation of large primary austenitic dendrites and creates a base to form spherical crystals of primary austenite.The stronger temperature fluctuation in the melt containing many stirring-initiated rosette primary austenitic grains,together with the simultaneous remelting of the secondary arm roots primarily account for the deposition of the spherical primary austenitic grains. The preparation of nondendritic semisolid slurry for stainless steel 1Cr18Ni9Ti was studied. Experiments show that when stirred for 2-3 min under the test condition, the semisolid slurry with solid about 50% and spherical primary austenite in size of 100-200 μm can be obtained, and besides the slurry is easy to flow out through the bottom hole of the stirring chamber .More homogeneous temperature fields and solute fields of stainless steel1Cr18Ni9Ti melt appear because of the electromagnetic stirring, which restrains the formation of large primary austenitic dendrites and creates a base to form spherical crystals of primary austenite. The stronger temperature fluctuation in the melt containing many stirring-initiated rosette primary austenitic grains, together with the simultaneous remelting of the secondary arm root accounts for the deposition of the spherical primary austenitic grains.