Psycholinguistics is a discipline of the combination of psychology and linguistic, which is to study how psychology can influence the teaching and learning of language acquisition, and how to learn and teach language more effectively and better by means of psychology elements. Through the study of psycholinguistics, we can know how people use language or what the mental process a person use in producing and understanding language, which can help us to conduct teaching in a scientific way. In this paper, significance and application of psycholinguistics is discussed in some aspects of English teaching, which are development of speech and production, language acquisition, text and discourse, and bilingualism.