Abstract: The thin-sections of more than 500 hailstones, which were collected from four hailstorm cases in the west mountain area of Xinjiang during summer in 1982,are analyzed.Detailed classification of hailstone embryos is made according to their air bubble and crystal structure and the relationships between the statistical characteristics of the embryo type distributions and hailstorm cells are studied. It is found that there exist clear differences between the embryo type distributions in weak cells and those in complex cells.