中文摘要：

汉语虚词在衍生过程中往往伴随着语音弱化。语音弱化主要体现在以下三方面：声韵调的变化，产生记音字，结构省缩。记音字的出现以及结构省缩都源于声韵调的变化，它们之间存在一种因果关系，不过声韵调的变化并不一定会导致记音字的出现和结构省缩。虚词衍生过程中偶尔还会出现语音强化，语音强化其实是语音弱化的另一种表现形式。语音弱化对语法化的影响主要表现为：促使虚词语义分化，到一定阶段还会衍生出新的虚词，另外，常常会加速语法化的进程。

英文摘要：

Phonological forms often reduced when their meaning bleached. This process is called as sound erosion and can be embodied in three aspects： the Chinese initial and final and tone changed, homophone produced, structure reduced, and the later two changes are results of the first one though not always appeared. Sometimes sound is strengthened in the emerging process of empty words. In fact, it is another form of the sound erosion. The central effects of sound erosion to grammarticaliza tion are： bringing on meaning polarization, creating new empty words, quickening up the process of grammarticalization.