This research is part of the doctoral thesis requirements entitled Perception domain in interpretation and communication of speech, this study is in the field of psychological language science and is an attempt to analyze the main theoretical fields of speech and how to reach Speech perception By  demonstrating  interact between sensory and the perception of speech, the influence of both vision and hearing canal in the process of speech perception based on acoustic cues of sound signals of speech, the acoustic signs (the place of voice expression, the way the voice is expressed and when the voice starts) play an important role in recognizing and perception and separating the sounds.The visual channel gives the listener information about where the sound is expressed and the auditory channel gives the listener information about how the sound is expressed and when the sound starts. Infants are able to use visual and auditory information to recognize and follow the listener's voice.