Sliding gate control system is widely employed in continuous casting process of steel to control flow rate of molten steel.As molten steel passes through a sliding gate,uneven flow develops.This will cause asymmetrical distribution of flow and temperature field in mold consequently,formation of vortex near the nozzle and entrapment of CC powder into the molten steel.etc,which have negative effect on process productivity and product quality.To suppress the uneven flow,electromagnetic swirling flow has been proposed to impose on the flow in submerged entry nozzle below the sliding gate.In this study the uneven flow developed by incompletely open sliding gate and the suppression of this uneven flow using electromagnetic swirling flow are numerically studied in round billet continuous casting of steel process.The improvement of the flow and temperature filed in the submerged entry nozzle and mold are investigated.It is found that:The uneven velocity in nozzle can be suppressed by electromagnetic swirling flow,and the flow and temperature field in mold be improved obviously;With the increase of electromagnetic swirling intensity,the effect of uneven flow can be almost completely suppressed. Sliding gate control system is widely employed in continuous casting process of steel to control flow rate of molten steel. As molten steel passes through sliding gate, an uneven flow develop. This will cause asymmetrical distribution of flow and temperature field in mold of, formation of vortex near the nozzle and entrapment of CC powder into the molten steel. etc, which has a negative effect on process productivity and product quality. o suppress the uneven flow, electromagnetic swirling flow has been to impose on the flow in submerged entry nozzle below the sliding gate.In this study the uneven flow developed by incompletely open sliding gate and the suppression of this uneven flow using electromagnetic swirling flow are numerically studied in round billet continuous casting of steel process. the improvement of the flow and temperature filed in the submerged entry nozzle and mold are investigated. It is found that: The uneven velocity of the nozzle can be suppressed by electroma gnetic swirling flow, and the flow and temperature field in mold be improved obviously; With the increase of electromagnetic swirling intensity, the effect of uneven flow can be almost completely suppressed.