Using the observation data from three S-band Doppler weather radars in Hunan,22 supercells in 10 severe convective storms have been analyzed.The results show that the supercellls might evolve from isolated storms,multicell storms,or storms in mesoscale convective weather systems;supercells contained low-topped supercells and mini-supercells;most supercells’ duration was more than one hour,and the shortest 24 minutes;the maximum base reflectivity factors of supercell storms were all over 63 dBZ and 54.5% of them above 70 dBZ;the maximum rotational velocity of mesocyclones in supercell storms was 24 m·s^-1 and the largest vertical vorticity of those 5.3×10^-2 s^-1;the major characteristics of low-level echoes of supercells were the hook echo,inflow gap,outshoot of storm’s main body that protrudes toward the low-level inflow,and vertical structural characteristics of WER or BWER;the severe convective weathers that supercells mainly produced were large hail,strong wind,tornadoes and rainstorms.Among them,hail and strong winds were mostly likely.This note has discussed where and when could the supercells possibly genesis?what could be the frequentness and repetitiveness of the supercells?and why could the relationship between environmental shear and the movement of supercells differ in different developing stages?All those aid supercell forecast.