Abstract: The doppler radar data and hail disaster data of Shaoyang city,Hubei Province from 2012 to 2017 were used to select 7 hail weather processes for statistics, and several warning indicators of hail formation were summarized. Warning indicators include that there is strong echo of 60 dBz, and the horizontal scale is more than 15 km; There is high overhang of reflectivity values （50 dBz or higher）, strong reflectivity height -20 ℃ or higher layer height; More than 40 kg/m² VIL maintain more than 30 minutes; VIL surges by 10 kg/m² for 1 individual sweep, and the maximum value of VIL is greater than or equal to 40 kg/m²; The velocity field has a cyclone, headwind zone and other characteristics or several characteristics. Three-body scattered spike, hook, strip, bow and other echo characteristics can be used as auxiliary indicators to quickly identify hail and give early warning. These indicators have been applied to the trial report of the hail weather process from 2017 to 2018, and the early warning indicators have played an important role in the artificial hail prevention work.

Key words: hail disaster, doppler radar, feature analysis, early warning indicators, artificial hail prevention, Shaoyang city