Abstract：Bo'ai dialect in Henan province belongs to Huoji small pieces which is part of the Jin dialect of Hanxin pieces in Chinese dialects. Among the 11 entering tones existing in the present dialect, tail vowel is glottal stop terminal [-], and the nuclei of vowels are [a][]and []. Even though the entering tones' category is nearly organized, it still has the evolution phenomenon of lost vowels. Experiments show that some of the entering tones appear a special model of double tune.

Keyword：Bo'ai dialect;glottal stop terminal [-];evolution phenomenon;double tune;