A Chinese vowel diagram or Chinese vowel chart is a schematic arrangement of the vowels of the Chinese language, which usually refers to Standard Chinese. The earliest known Chinese vowel diagrams were made public in 1920 by Chinese linguist Yi Tso-lin with the publication of his ''Lectures on Chinese Phonetics'', three years after Daniel Jones published the famous "cardinal vowel diagram" in 1917. Yi Tso-lin refers to those diagrams as "(simple/compound) rhyme composition charts ()", which are diagrams depicting Chinese monophthongs and diphthongs.
Unlike the trapezoidal English vowel diagram (right), the Chinese vowel diagram (left) is triangular. The phonetic symbols used in this diagram are known as the "National Phonetic Alphabet ()" or "National Phonetic Symbols ()" or simply "Bopomofo". Six vowels or monophthongs (simple rhyme or 單韻) are depicted in this diagram. They are:
*ㄧ (IPA ), as in ㄧˋ (易, easy)
*ㄨ (IPA ), as in ㄨˋ (霧, fog)
*ㄦ (IPA ), as in ㄦˋ (二, two)
*ㄛ (IPA ), as in ㄆㄛˋ (破, broken)
*ㄜ (IPA ), as in ㄜˋ (餓, hungry)
*ㄚ (IPA ), as in ㄆㄚˋ (怕, fear)
Note that this chart utilizes four degrees of vowel height (closed, half-closed, half-open, open), three degrees of vowel backness (front, central, back), and three degrees of vowel roundedness (spread, natural, round). The placement of ㄦ() may be questionable, but all other vowels are generally speaking where they ought to be.
The same vowel chart is used to depict diphthongs (compound rhyme or 複韻), with an arrow indicating the starting position and ending position of each diphthong. Six falling diphthongs are depicted in the following diagram. They are：
*ㄩ (IPA ), as in ㄩˋ (玉, jade)
*ㄝ (IPA ), as in ㄧㄝˋ (夜, night)
*ㄟ (IPA ), as in ㄌㄟˋ (累, tired)
*ㄡ (IPA ), as in ㄉㄡˋ (豆, bean)
*ㄞ (IPA ), as in ㄉㄞˋ (帶, belt)
*ㄠ (IPA ), as in ㄉㄠˋ (道, way)
The reason why apparent monophthongs ㄩ and ㄝ are included in this chart is purely phonological and historical. According to this theory, those two vowels are really diphthongs, i.e. ㄧㄨ and ㄧㄝ . Even so, those vowels should be considered "rising diphthongs" on a par with those in the next diagram.
The next diagram depicts four rising diphthongs, as follows:
*ㄧㄛ (IPA ), as in ㄧㄛˋ (唷, an interjection)
*ㄨㄛ (IPA ), as in ㄨㄛˋ (臥, lie)
*ㄧㄚ (IPA ), as in ㄧㄚˋ (亞, Asia)
*ㄨㄚ (IPA ), as in ㄨㄚˋ (襪, socks)
==Symbols of Mandarin vowels==
The exact number of vowels in Standard Chinese may vary depending on the phonological theory and methodology. The major systems for Chinese transliteration are listed below
Note that the "apical vowels", often represented as and by sinologists, that appear after apical dental and retroflex fricatives/affricates. Notice that those two IPA symbols are now considered Obsolete and nonstandard symbols in the International Phonetic Alphabet.
Given the fact that Mandarin Phonetic Symbols and Pinyin have both been adopted by Chinese governments and that Pinyin is currently the international standard for Chinese romanization, it is reasonable to propose a Mandarin vowel diagram with the nine officially recognized vowels, as shown on the right.
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