Hail is also commonly known as "hail" and "cold child" in some parts of China. More common in summer or at the turn of spring and summer. From mung beans and soybeans to chestnuts and eggs, the hail is bigger than grapefruit. Except for Guangdong, Hunan, Hubei, Fujian and Jiangxi provinces, there is less hail weather in China, and there are different degrees of hail weather in various regions every year. Especially in the mountainous and hilly areas in the north, the terrain is complex, the weather is changeable and there are many hail, which is very harmful to agriculture. Severe hail destroys crops and houses, and people are often injured and livestock die. Therefore, the hail disaster is extremely harmful and is a serious natural disaster.