The theory of dualism (not to be confused with Plato’s dualism) is a relatively new theory in the field of
psychology, which provides new ideas and methods for understanding and solving problems related to human psychology. This theory finds application in many fields and has far-reaching influence. This essay provides an overview of the theory of dualism followed by an analysis of its connotations, characteristics, and significance. Subsequently, its development at home and abroad is described. Finally, its main applications and prospects are outlined, hoping to provide references and insights for the further development of this field.