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It is essential as well as vital to require the higher quality of the billet today. One of the major measures to raise casting efficiency and enhance the quality of billet is effective control flow behavior of molten steel in the mold. It indicates that the swirling flow in the submerged entry nozzle (SEN) has a great effect on improving the uniformity and stability of the outlet flow of nozzle, due to reducing the meniscus fluctuation and homogenizing the distributions of flow and temperature in the mold.1–5) And outlet flow angle and outlet port design of swirling flow SEN for slab caster is done for further improvement of flow pattern in the mold but it cannot solve the problem—the flow impacting the wide face.6,7) Furthermore, the commercial test of swirling flow continuous casting is conducted, in which a refractory swirling blade was installed in SEN, in the case of slab, subsurface pinholes and sliver defects are remarkably reduced, but it is liable to cause clogging in SEN, which limits the further application.8–10) A new method for swirling flow generation in nozzle, without the problem of clogging and easy for controlling swirling velocity has been proposed by our team in 2005.11) In previous work, the flow and temperature fields in the mold and SEN are studied numerically when this kind of electromagnetic swirling flow in SEN.12) However, not only the velocity was only partly measured near the meniscus and nozzle outlet in the experiments above but also both two swirling methods cause flow impacting the wide face, which is not good for flow control. Besides, Flow Behavior in the Slab Mold under Optimized Swirling Technology in Submerged Entry Nozzle