Based on 191 hail cloud echoes and variations obtained with a 711 radar in Jinan during June to August from 1976 to 1987 and the rader echo during June to August of 1989—1991 operational period by antihail gun in Pingyuan county,Dezhou district,the effect of hail suppression is evaluated. The results show that echo top altitude and its descent rate, bright belt of 0℃ layer and structures of radar echo are all varied obviously after the hail suppression operations. The analysis is aiming at propelling to develop the cause of hail suppression in Shandong provice and making greater contributions to decrease natural disasters.