After comparing the features of the dialect of Yongzhou of Hunan and those of the dialects of South Guangxi, the author finds out some similarities between them.

Spectro-mode features of unaspirated consonants by speakers with cleft palate;

It is found that adaptive perceptual training improved categorical perception of [pa] and [pha],and the effect transferred to the perception of [ta] and [tha],which indicates that perceptual training improves categorical perception of aspirated/unaspirated contrast as a whole.