| Summary: | In order to optimize the submerged entry nozzle (SEN) for 200 mm x 1 300 mm vertical slab casting mold, the effect of parameters of nozzle structure (cross section dimension of side port- 40 mm x40 mm and 40 mm x80 mm, and angle of port- + 15° and - 15°) and process parameters ( submerged depth 100 ~ 130 mm and casting speed 0. 45 ~ 0. 65 m/min) on fluctuation of liquid level has been simulated and studied by 1 ： 1 water model. Results show that the effect of nozzle structure parameters on fluctuation of liquid level is more obvious and the structure of 2<sup>#</sup>nozzle with side port dimension 40 mm x40 mm and angle of port +15° has better service performance； the effect of submerged depth on fluctuation of liquid level isn' t appreciable ； and the effect of casting speed on fluctuation of liquid level relates to nozzle structure, and the descending order of sensitivity of nozzle structure to casting speed is nozzle 2<sup>#</sup>(40 mm x40 mm, +15°), nozzle 4<sup>#</sup>(40 mm x40 mm, - 15°) , nozzle 3<sup>#</sup>(40 mm x 80 mm, - 15°) and nozzle 1<sup>#</sup>(40 mm x 80 mm, + 15°).
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