Abstract:The process of communication by means of speech involves the generation of sound by a speaker and interpretation of that sound by a listener.So language communication involves both speaking and listening.This paper explores the mechanism and characteristics of human language communication from the perspective of listening and speaking.The author illustrates the relationship between listening and speaking through the following five aspects:1) the complementary distribution of sound energy with different frequencies between articulation organs and auditory organs; 2) low-frequency sensitivity and vowel pattern; 3) the adaptive design of speech sound systems and enhancement of perceptual differences; 4) quantal theory and speech perception; 5) speaker's co-articulation and listener's compensation.It is proposed that speaking and listening have mutual cooperation and mutual restriction in the process of communication.Once this relationship is out of balance, it can lead to misunderstandings and sound changes may occur.