The recent status of hail suppression in Soviet Union, United States, China, and many countries in Europe are presented, based on the results published in the international weather modification conferences. The methods of hail,suppression operation and evaluation of hail prevention effects, especially the statistical method of kinetic energy of hail fall to the ground are also involved in the paper.Timing and correct placement of seeding materical and time of seeding are particularly critical to "successful suppression.