In order to obtain dual metal slab,mi xing flow of molten metals in a mold wa s controlled by imposing a static ele ctromagnetic field from the outside of the mold,and the d ual metal slab which has different pr operties in its two sides was continu ally cast by pouring two dif-ferent molten alloys,Sn and Sn +Pb,a t the same time.The results of numerical simulation show that electromag netic force acts on flow of melt in a certain height range of the mold,and the effect of magnetic field on the flow of the melt is different at different area of the mold;When magnetic flux density B is 0.2T,the flow of the melt at exit of the nozzle is strongly suppressed,d epth of jet is decreased,so when B is more than 0.2T,ideal brake effect is achieved.