Abstract: A local hail process on July 13, 2015 in Menyuan of Qinghai was diagnosed according to the atmospheric circulation situation, surface chart and physical elements data etc. The effect of artificial hail suppression was quantitatively analyzed based on the characteristics of hail cloud before and after shelling by a radar. The results showed that: the hail weather happened under high temperature, high humidity and strong vertical wind shearing situation in Menyuan; the highest rate of lightning appeared during hailing, where a strong echo was in a strong developing level, negative lightning was obviously more than positive lightning; radar echo top height declined after shelling hail clouds, echo strength reduced, and liquid water content (VIL) 45 kg/m2 range became smaller.