喉牙音是人类最原始、最基本的声音。汉语中喉牙音产生最早 ,其后有唇音 ,其后有舌音 ,其后有齿音。舌音、齿音、唇音中不少字的读音是从喉牙音分化、音转而来的 ,其中以舌、齿音字居多。发生音变的时代 ,早的在春秋 ,迟的到宋金 ,甚至明清 ,一般发生在汉代和魏晋南北朝。探讨这一重要的课题 ,不仅对研究汉语语音史、汉字史有着直接的意义 ,而且有助于我们解释许许多多疑难问题和语言现象。 Throat sounds are the most primitive and basic human voice. The earliest generation of throat teeth in Chinese, followed by lip sounds, followed by tongue sounds, followed by tooth sounds. Tone tone, tooth tone, lip sound in many words of pronunciation is divided from the throat tooth sound, sound from, of which the tongue, tooth sound words mostly. Occurred in the era of sound and change, early in the Spring and Autumn, later to Song Jin, and even the Ming and Qing Dynasties, generally occurred in the Han Dynasty and the Wei, Jin and Northern and Southern Dynasties. To explore this important topic not only has direct significance for the study of the history of Chinese phonetics and Chinese characters, but also helps us to explain many difficult problems and linguistic phenomena.