Based on the NCEP reanalysis data and the T-LogP data of Yibin and Weining station and the Doppler radar data of Zhaotong station the hail in Zhaotong in July2017 was analysed. The results show that the hail has the following major characteristics:1)The hail was releated to the West Pacific Subtropical high and the Tibetan high;2) In the case of dry invasion,dry on the wet and deep wet layer configurations hail may happen in Zhaotong;3)The convective available potential energy corrected to 2pm was more indicative than the convective available potential energy at 8am;4) The maximum radar reflectivity of hail cloud was more than 55dBz, the echo top reached more than 10km, the storm top exceeds 70% of the echo top and the maximum Vertical integrated liquid was above 14 kg / m2.