In the present work, a ladle-tundish-mould model throughout the whole multiple pouring (MP) process is proposed to describe the carbon distribution in the tundish and solidification process in the mould. The water analog experiment was carried out to simulate the carbon transportation and diffusion in the liquid steel in the tundish based on similarity rules. The experimental results were compared to the predicted results in a good agreement. The carbon distributions along three transverse sections in the riser of 438-t steel ingot were measured and found to be in good agreement with the simulated results, proofing the macrosegregation model. In addition, different pouring processes including the original MP process and delayed MP technique were considered to investigate their effects on the final macrosegregation of ingot. The results show that the delayed MP process has greater effects on the reduction of the positive segregation in the riser and in the centre region of ingot than the traditional MP.