大多数客方言点有带[u]介音韵母。少数无[u]介音的客家方言主要分布于东江流域及其相邻地区;古合口二等[u]介音的有无亦呈现出明显的地域性。[u]介音韵母一般与中古合口韵对应并受主元音影响,古开口韵今读[u]介音的有无则与主元音及韵尾的发音特点均相关。与[u]介音相拼的声母多是软腭辅音。客方言[u]介音大多具音位性,它应该是早期汉语唇化软腭音声母的唇化成分发展而来。综合来看,今天梅县等音系中的[u]介音不宜取消。 Most guest speakers have [u] mediated vowels. A few unguided dialects of Hakka dialects are mainly distributed in the Dongjiang River valley and its adjacent areas. The presence or absence of the ancient sound of the mouth [u] also shows obvious regional characteristics. [u] The vowel consonants generally correspond to the middle vowels and are influenced by the vowels. The ancient vowels are read today [u] Are there any correlations between the vowels and the vowel features of the main vowels and the end vowels? The initial consonant with [u] is the soft palate consonant. Guest dialect [u] most of the vowels are phonetic, it should be the early Chinese lip cleft palate sound consonants from the development of the lip composition. Taken together, the pronunciation of [u] in Mei County and other musical systems should not be canceled today.