Individuals who experience, witness or encounter one or more actual deaths involving themselves or others, or are threatened with death, or are seriously injured, or whose somatic integrity is threatened, will be prone to catastrophic reactions, so what should we do to prevent this disease after a bad encounter? 1, cognitive behavioral therapy: to help you identify those problematic ways of thinking. For example: blaming the loss of a family member on your own failure to take care of them. Cognitive therapy: It can reverse this belief, for example: “It’s not your fault, you did your best”. 2. Exposure therapy: It assumes that you learned the thoughts, feelings and scenarios that caused your fear in the disaster. During therapy, in a safe and controlled environment, the therapist will ask you to retell the trauma again and again until you no longer have fear of the memories. The goal is to teach you to confront and control your fears. 3. Systematic desensitization therapy: With the help of the therapist, the patient first recalls a relatively minor traumatic memory, matter, person or scene. At the same time, the therapist teaches the patient to mediate emotional, physical, and psychological reactions to these traumatic memories using progressive relaxation of muscles, limbs, and breathing. The therapist then guides the patient to gradually recall increasingly intense traumatic experiences and allows the patient to use relaxation techniques to regulate physical and psychological reactions. 4. Group therapy: Share experiences with group members to deepen understanding, tell their own stories and feelings, support each other, and discuss how to cope and face reality rather than the past.