Based on the air-sounding data, the CIND3830-CC CINRAD data and surface meteorological data, and 21 hail weather processes in Pu’er during 2013-2020， this study gives the difinition to storm cells with hail diameter ≥20 mm as large hail storm cells, storm cells with hail diameter ≥5 mm and less than 20 mm as medium hail storm cells and storm cells with hail diameter <5 mm as small hail storm 〖JP2〗cells (GB/T27957-2011). The Doppler radar echo characteristics of small hail, mdium hail and large hail are comparatively analyzed. The results show that hail storm cells have common characteristics. High top and high bottom structure of the radar echo, height above 5 km and large echo gradient and composite reflectivity (CR)≥55 dBz、VIL≥23 kg·m-2、H45 dBz≥7.5 km、H45 dBz-H0℃≥2.8 km. VIL shows jump phenomenon in 67% hail storm cells, appearing 5-10 min before the occurrence of hail falls. The bigger the magnitude of the jump, the greater the corresponding VIL. The hail storm cells have obvious convergence characteristics and large hailstorm cells often have mesocyclone characteristics. All the large hail storm cells are significantly greater than the medium and small hail storm cells in VIL/H. H50 dBz-H-20℃ of most large hail storm cells are significantly greater than those of medium and small hail storm cells. Large hail storm cells in mature stage often lasts significantly longer than medium and small hail storm cells. The echo overhang structure of large hail storm cells is often more than the medium and small hail storm cells, and DVIL and the rotation speed are often greater than medium and small hail storm cells. ET, VIL jump characteristics, TBSS and V-notch can not be used as indicators to identify different grades of hails.