Abstract: The effect of swirling nozzles with different processing parameters on the flow field in a mold is studied using numerical simulation. The results show that the high-temperature dissymmetry in the upper mold is increased a little by using a swirling nozzle, but the meniscus temperature and its uniformity are increased. The temperature difference between nozzle inner and meniscus is 15℃ for a traditional nozzle and 10℃ for a swirling nozzle. Increasing the casting speed or decreasing the blade height can increase the temperature at meniscus. When the swirling angle is 120° or the distance between blade and nozzle bottom is 390mm, the temperature of molten steel is the highest at meniscus.