There are 26 pinyin letters * * *, namely: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z. The vowel table is: a, o, e, I, u, u, ai, ei, ui, ao, ou, iu, ie, u e, er, an, en, in, u n, un, ang, eng, ing, ong.

Chinese Pinyin and Vowel (mǔ) is a term of Chinese phonology in China, which is the part of Chinese pronunciation 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.

Vowel classification of Chinese Pinyin (based on the primary school Chinese Pinyin textbook);

1, single vowel: a, o, e, I, u, ü;

2. compound vowels: ai, ei, ui, ao, ou, iu, ie, ü e;

3. Special vowel: er;

4. Nasal vowels: an, en, in, un, ün, ang, eng, ing, ong；; Among them, the front nasal vowels: an, en, in, un, ü n; After nasal vowels: ang, eng, ing, ong.

There are 24 vowels in Chinese Pinyin in primary schools, including 6 single vowels, 8 complex vowels, 1 special vowel and 9 nasal vowels (5 front vowels and 4 rear vowels).