Various parameters are inversed in the process of single hail cloud development by using 3 Doppler weather radar data and hail information, and the relationship between various parameters and occurrence of hailstorms is extracted With 7 single hailstorm cases during 2016-2019 in the central and western Guizhou Province.Results show that: (1)The evolution of the second-order jump hail cloud showed a trend of development-jump increase-hail falling-attenuation-redevelopment-jump increase-hail; (2)The averages of maximum radar base reflectivity(MaxREF),the height of 45dBz(H45dBz)and top of storm(H0dBz),vertically integrated liquid(VIL) are 63.4 dBz、7.55km、12.01km、39.08 kg/m2; (3) During the occurrence of hail, the sudden- increase phenomenon of MaxREF、H45dBz、H0dBz and VIL between the two volume scan are 5.89 dBz、2.19km、2.82km、17.5 kg/m2 on average.This transition occurred 21.4、22.2、28 and 28.8 min earlier than the average time of hailstorm occurrence.Such phenomenon could be an important criterion of hail warning.