Applying theory of the fluid dynamics to the molten steel flow from inlet to outlet of port for submerged entry nozzle（SEN）in the continuous casting system, a novel geometry of the ejection port is designed to minimize the energy loss with maintaining the flow velocity homogeneous in the whole port area. Both computational fluid dynamics（CFD）analysis and water model experiments have verified that the ejection flow velocity is significantly homogenized at the port outlet when the newly designed SEN is used, with resulting in the reduction of the maximum port velocity（MPV）to the limit. Since arising of the turbulent energy in the flow is intensively suppressed by minimizing the energy loss at the port area, the improvement of anti-erosion property of the SEN is also able to achieve by reducing adhesion of the inclusions in the molten steel to the ejection ports. Application of the new geometry SEN to the continuous casting operation is highly expected to contribute to process innovation of the steel production in terms of the increase in stability of the operation itself as well as quality of the products through minimizing the MPV of the molten steel flow and improving the adhesive and abrasive properties of the SEN..

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