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The specific distribution characteristics of inclusions along with the sliver defect were analyzed in detail to explain the formation mechanism of the sliver defect on the automobile exposed panel surface. A quantitative electrolysis method was used to compare and evaluate the three-dimensional morphology, size, composition, quantity, and distribution of inclusions in the defect and non-defect zone of automobile exposed panel. The Al2O3 inclusions were observed to be aggregated or chain-like shape along with the sliver defect of about 3-10 μm. The aggregation sections of the Al2O3 inclusions are distributed discretely along the rolling direction, with a spacing of 3-7 mm, a length of 6-7 mm, and a width of about 3 mm. The inclusion area part is 0.04％-0.16％ with an average value of 0.08％, the inclusion number density is 40 mm?2 and the inclusion average spacing is 25.13 μm. The inclusion spacing is approximately 40-160 μm, with an average value of 68.76 μm in chain-like inclusion parts. The average area fraction and number density of inclusions in the non-defect region were reduced to about 0.002％ and 1-2 mm?2, respectively, with the inclusion spacing of 400 μm and the size of Al2O3 being 1-3 μm.