The results of hail suppression have been examined based on the data of hail cloud radar echo and the characteristics of the falling hailstones.The values of radar echo top height,indensity and 30dbz strong echo height of hailcloud after the anti-aircraft gun operation are remarkably less than that of before the operation.The maximum diameter,number density,duration of hailfall,kinetic energy,masses,kinetic energy fluxes and mass fluxes of hailstone in the operation area less than that of the contrast area.