The spatial temporal distribution of hail is analyzed based on the hail data from 1961 to 1999 at 90 weather stations in Xinjiang. The hail occurrence is more frequent in mountainous areas in the western and middle part of Xinjiang and concentrates in the period from April to October, and in most of the days in June. More hail occurs in afternoon and most in evening. The persistence time of most hail is within 6 minutes. The local hail (1279) was more than systematic hail (76) during 1961 to 1999. Hail weather processes were closely related to topography, mainly occurred in mountainous area. Hail weather mostly appeared only 1 day, mainly in summer. Systematic hail weather was caused by mesoscale high pressure.