Abstract: The deuterium,crystal structures of 5 hailstones from two severe storms have been examined.Hailstones fell in Ding Hai area,on 23 July 1983 and 6 August 1983.Placing an absolute temperature scale against the deuterium values were discussed.The deuterium concentration on 23 July had values ranging from -65.8-76.6‰ and on 6 August had -6.1-58.6‰,these corresponded to the hailstones at ambient temperatures about -18-23℃ (altitude 7.7-8.6 km),and -1.3-27℃ (5.9-9.0 km).The type of embryos in the hailstones was conical graupel.The deuterium values indicated that the graupel embryos were formed at temperature -16.8-19.5℃ (on 23 July) and -11.8-20℃ (on 6 August).It is found that hailstones grew at middle or upper part of the cloud,the hailstones grew continually in the updraft on 23 July and the hailstones were in up and down motions on 6 August.In this paper,the updraft was calculated by the two methods and hailstones trajectories were discussed.