Yield and quality of sugar orange are closely related to meteorological conditions,especially the low temperature and cold injury in mature period of fruit. To study the influence of winter cold injury on sugar orange industry of Guilin,the chilling injury weather in each county of Guilin planting sugar orange is analyzed,and the disastrous cold weather and its defense measures are studied. Frost,freezing and cold wave happen in Guilin winter sometimes,and the disastrous weather could seriously harm maturing sugar orange or that in the tree,causing peel coke,dehiscent fruit,fruit drop and quality decline. It can effectively reduce the loss by chilling injury and guarantee excellent quantity and high yield of sugar orange by timely understanding weather change information,scientifically managing water and fertilizer,and doing film cover well. Yield and quality of sugar orange are closely related to meteorological conditions, especially the low temperature and cold injury in sugar orange industry of Guilin, the chilling injury weather in each county of Guilin planting sugar orange is analyzed, and the disastrous cold weather and its defense measures are studied. Frost, freezing and cold wave happen in Guilin winter sometimes, and the disastrous weather could damage harm maturing sugar orange or that in the tree, causing peel coke, It can effectively reduce the loss by chilling injury and guarantee excellent quantity and high yield of sugar orange by timely understanding of weather change information, scientifically managing water and fertilizer, and doing film cover well.