Abstract: The uniformity of a 7-stream tundish in a steel plant was studied by establishing a water model with the scale of 1:2.5.Experimental results show that the multi-stream tundish has poor uniformity with no flow control devices and the uniformity difference of each stream is obvious. The liquid steel flow of each stream in the tundish before optimization has a high dead zone proportion of 45.5%. It is found that the importance of flow control devices is U-type dams > turbulence suppressors > trapezium dams. After optimization,flow control devices have good applications in the steel plant,the uniformity of each stream improves greatly,and the proportion of the dead zone decreases to 23.1% from 45.5%.