The radar echo features of three types of hail clouds and the hailcloud identification methods by radar echoes (such as echo type, echo parameters and synthesis indexes) are described on the basis of the outcomes and experiences accumulated from the 40year hail suppression operation in Liaoning Province. Combining with the numerical results of a hailcloud model, some experiences of seeding in hailgenerating areas (liquidwater accumulating zones, supercell storms and multiplecell storms) in hail suppression operations are summed up. The results are useful to hail suppression operation.