Vowel refers to China's Chinese phonology term, which is the part of Chinese phonology except initials and tones. Formerly known as rhyme Vowels consist of three parts: the beginning (middle tone), the belly (main vowel) and the end. According to vowel structure, it can be divided into single vowel, compound vowel and nasal vowel.

The parts of Chinese pronunciation other than initials and tones. Formerly known as rhyme Vowels can be divided into three parts: the beginning (middle tone), the abdomen (main vowel) and the end. For example, the vowel of "Niang" niáng is iang, where I is rhyme, A is rhyme and NG is rhyme. Every vowel must have a rhyme belly, and the beginning and end of the rhyme are dispensable. For example, the vowel of "da" à is a, a is a rhyme belly, and there is no rhyme head and no rhyme end; The vowel of "gua" guā is ua, where U is the rhyme head, A is the rhyme belly, and there is no rhyme ending; The vowel of "Dao" dāo is ao, where A is the rhyme belly and O is the rhyme ending, and there is no rhyme.