Abstract: rauma refers to the catastrophic or traumatic events harmful to individuals, including body injury and psychological harm. Strong emotional and psychological reaction caused by traumatic factors will form psychological shadows, and the improper coping of these events will lead to a post-traumatic stress disorder. This paper explored the roots of psychological trauma and the brain mechanisms of post-traumatic stress reaction or disorders，which were caused by traumatic events from a psychological point of view. Finally, according to the latest psychological research results, some suggestions of intervention are provided for the relevant departments to make relevant policies

Key words: psychological trauma, post-traumatic stress reaction, PTSD, emotional memory, intentional forgetting