Based on the photographs of hailstone slices from the supercell occurring on May 1, 1981 over the Anhui-Jiangsu area north of the Yangtze river, an analysis is made of the types of embryos, characteristic features of stratification, distribution of air bubbles and icecrystal structures. The results suggest that both the clear and opaque layers are of the wet-growth category and thus these hailstones outfrom supercells are formed in the cloud under wet-growth process.Finally, a preliminary survey of the physical process in the formation of clear and opaque layers under wet-growth conditions is presented.