Abstract: People who had experienced trauma often developed dissociative symptom. There are several theories about trauma-related dissociative symptom, such as structural dissociation of the personality, betrayal- trauma theory, avoidant-encoding hypothesis, vigilance avoidant hypothesis, the article reviews the studies and the findings about these theory. Based on the theory reviews and analysis, the article propose future investigation should combine cognitive behavior research and cognitive neuroscience studies, as well as more close link clinical psychotherapy and medicament. Basis cognitive experiment studies and clinical psychotherapy, we will find out more knowledge of trauma-related memory in detail, paying more attention to inner brain mechanism and orientation

Key words: trauma, dissociative, posttraumatic stress disorder (PTSD), avoidant-encoding