通过测量果实的生长量，分析果实的性状，大气蒸汽压亏的变化，观测田间裂果的动态，探讨红江橙裂果的原因。红江橙果皮薄，韧性差是其裂果易感性的主要因素。成熟期的生理生化变化可能参与裂果的机制。果实的成熟期是裂果的高发期，如遇大气蒸汽压亏急降将导致裂果率急剧上升. By measuring the growth of fruit, analyzing the changes of fruit traits, the pressure drop of atmospheric vapor, observing the dynamic of field crack, and discussing the reason of the crack of red river orange. Hongjiang orange peel thin, poor toughness is the main factor susceptibility to cracking. Physiological and biochemical changes during maturity may participate in the mechanism of split fruit. Fruit ripening is the high incidence of split fruit, in case of a sharp drop in atmospheric vapor pressure will lead to a sharp rise in the rate of split fruit.