通过对汉语唇齿通转材料、民族语言的语音演变情况和汉藏语同源词比较等材料分析,可以推论上古汉语*sP-类复声母的字,在塞擦音产生之前主要与擦音心母谐声。之后*sP-的s词头慢慢弱化并最终失去,受短元音复化影响,这类字中古时大多演变为三等唇音字,并具有重纽四等特征。 Through the analysis of the materials of Chinese lips and teeth, the evolution of speech in national languages ​​and the comparison of homologous words in Chinese and Tibetan languages, it can be deduced that the characters of * sP- Master harmonic sound. After that, * sP-s’s head slowly weakens and eventually loses. It is influenced by the complexing of short vowels. Most of these words evolved into third-class lip sounds in ancient times, and they have the characteristics of heavy nodules.