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For a multistream tundish, the uniformity among the streams plays a significant role in the quality of molten steel. How to analyze the uniformity quantitatively and optimize structures of a multistream tundish is an important research content for a multistream tundish. A new approach was proposed to quantify the uniformity among the streams. And a physical study and a numerical study were carried out to optimize the structure of the diversion hole based on the prototype of a six-stream tundish in a steel plant. On the basis of average residence time, the uniformity of each flow was considered fully and then the optimal structure of the diversion hole was obtained by means of the comprehensive analysis of temperature field and velocity field. The results show that the optimum structural parameters adopted for diversion holes are height of 20 mm, angle of 15° and diameter of 80 mm.