Abstract：Based on a three-strand tundish for bloom continuous casting, the flow field and temperature distribution of the tundish was studied by the FVM model. After analyzing and comparing the metallurgical behavior of the original and improved tundish, the results showed that: the original tundish without flow control devices was quite undesirable, which exists obvious short-circuit flow and the proportion of dead zone was large. The temperature difference among middle and side outlets was over 3K, which was unfavorable to uniformly control each strand casting. The flow performance of the steel in tundish was improved significantly with the adoption of weir and dams through modelling analysis. The dead zone fraction was reduced sharply, and the temperature difference between each strands reduced to 1K. The scheme with weir and high dam had a lower dead zone fraction, reduced by 17.9% and 9.6% comparing the original tundish, respectively. A consistent melt flow pattern between different strands was obtained, which was favorable to the overall metallurgical effect improvement of the tundish.