Abstract:Base on the theory of electromagnetic field and magneto hydrodynamic, an apparatus of double-driving by magnetic force media with permanent magnet has been designed and manufactured. The characteristics analyzed from theory and experiment show that the apparatus can drive and stir molten metal without any directly contact; the shape and wave of meniscus can be controlled by the apparatus. When velocity of down driver is 35 turns per second, the upper is 20 turns per second, surface of metal liquid is more straight with little wave. That is like-stabilization state of meniscus; under this condition solidification structure of continuously casting is100% fine equiaxed structure, initial solidification point is descended and the solidification shell become thinner and uniformity.