Abstract: To optimize the inclusion control level of GCr15 bearing steel and explore the influence of an asymmetric side-port submerged entry nozzle on the spatial distribution of inclusions in continuous casting bloom, field sampling and analysis were performed on the bloom. A numerical model was established that simultaneously considers the three-dimensional unsteady flow, heat transfer, solidification and the coupling of inclusion movement throughout the continuous casting process, as well as the capture of inclusions at the solidification front, to realize the prediction of the spatial position of residual inclusions in the continuous casting bloom at different times. The proportion of inclusions floating to the slag/steel interface increased from 1.9% to 17.9% when the particle size increased from 1 μm to 50 μm during the continuous casting process. Residual inclusions within the bloom exhibited an asymmetric distribution, with a tendency to accumulate 7.8-10.5 mm beneath the bloom surface. Inclusions less than 10 μm were more likely to be transported by molten steel flow into the deeper regions of the liquid pool, while inclusions with a particle size greater than 10 μm tend to accumulate at 1/4 to 1/3 of the inner arc side of the bloom.