In the long development of history, the mediaeval initial dental consonants, based on a certain rule, have been evolving continually, along with the changes of Chinese phonetics and the separation and combination of voice part.

This thesis will get whole Tongjia words of SHUOWEN TONGXUN DINGSHENG together, research mainly apico-dental initial of Tongjia words in SHUOWEN TONGXUN DINGSHENG,I hope my works can provide some evidences for further research in the ancient Chinese.

On the labial initials of LU Deming s fanqie system in Jindian Shiwen;

Zero initial syllables evolved consonants initial syllables which means that the pronunciation of zero initial syllables in the Chinese dialect or borrowed from other race languages became the consonant initial syllables.