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An experimental mold was built to study the flow in a flow control mold under high speed continuous casting.The effect of the magnetic field on the flow was investigated using mercury.The results show that the magnetic field can not only dampen the flow of liquid metal but also change its direction,and then redistribute the flow in the mold.When maintaining a constant distance between magnets,the fluctuation of the free surface is dampened because of the increasing magnetic flux density.The flow at the free surface is improved,and the penetration depth of the downward stream is reduced.The decrease in the distance between magnets promotes the brake effect and the flow is dampened in the upper eddy.