Abstract: Based on the continuous caster tundish dimension and process parameters used at the V-recovery and steelmaking plant,Panzhihua I. & S. Co.,a tundish model of 1/4 full scale was made of organic glass;The residence time distribution(RTD)curve of molten steel in the tundish was measured and the average residence time,and volumetric proportion of dead,plug-like and mixture zones were calculated.Theresults obtained are a basis to determine rational dam location,and it was proposed from these results that critical liquid level, minimal liquid level when replacing the ladle and normal production liquid level in the tundish,providing a guardance for continuous casting operation at Panzhihua I. & S. Co..