音韵学中所谓三十六个字母。在《康熙字典》“字母切韵要法”中,便将上述三十六个字分为九类,并编成歌云:见溪群疑是牙音,端透定泥舌头音,知彻澄娘舌上音,帮滂并明重唇音,非敷奉微轻唇音,精清从心邪齿头,照穿床审禅正齿,影晓匣喻是喉音,来日半舌半齿音。这三十六个字母所反映的是中古语音系统的书面读音,基本上与宋代陈彭年所编《广韵》的声纽相一致。清人钱大昕通过对《广韵》及 Phonology in the so-called thirty-six letters. In the “Kangxi Dictionary” “Letters cut rhyme”, they will be divided into nine categories of the above three words, and compiled into a song cloud: see Xiqun suspected tooth tone, end muddy tongue tone, Cherish mingniang tongue tone, to help 滂 and re-emphasize the lip, non-application lip light lip, refined heart evil tooth, according to wear Zen meditation orthopedic, shadow Xiaoyi Yu is the guttural, Half tooth. These thirty-six letters reflect the written pronunciation of the Middle Voice System and are basically in line with the sound of “Guangyun” by Chen Pengnian in the Song Dynasty. Qing dynasty money through the “Guangyun” and