Abstract: To find the characteristics of the environmental parameters of hail with different levels, seek the physical parameters and early-warning index of hail, based on NCEP/FNL (1°×1°) and Doppler weather radar data from 2006 to 2015, the physical parameters and radar echo were analyzed. The results showed that the precipitation capacity of the whole atmosphere increased with the increase of hail grade, the temperature difference between 850 hPa and 500 hPa was higher than 24℃, but not significant between each level. The vertical wind shear of 0~6 km was obviously higher than that of normal day. The height of characteristic level of June and July was higher than that of May, August and September. Layer height of red grade was slightly lower than that of others. Radar echo center intense, liquid water content and the top of echo increased with the increase of hail grade, and when the red hail occurred, the liquid water content reached 60 kg/m2 and the top of echo reached 14 km, these two parameters had guiding significance in short time forecast.