中古非唇音合口字-u-介音消失是豫鄂陕交界区域汉语方言的区域特征。总体来看,该区域方言合口介音呈现出明显的循序渐进性,从声组看,合口介音消失顺序为端泥>精>知>见;从韵摄看,合口介音消失顺序为蟹止>山臻>通。合口介音消失的次序与声母、韵母的发音机制有关。 The disappearance of the ancient non-lip-syllable-u-dialect is the regional characteristic of the Chinese dialects in the border area between Hubei and Shaanxi. Overall speaking, the dialect of this region showed obvious step-by-step progress. From the perspective of sound group, the order of disappearance of co-agent was End Mud> Fine> See>; from Yunjian, > Hill Zhen> pass. The order in which the vowels disappear is related to the pronunciation mechanism of initials and vowels.