Fear of the dark is clinically defined as fear of the dark, anxiety, or experiences that produce distress. Fear of the dark or fear of the dark can be treated clinically with a program of psychotherapy and medication. Psychotherapy uses cognitive behavioral therapy as the first line of treatment. Fear of darkness is a protective mechanism for the self, a normal expression of emotion, and patients cause their own fear and anxiety by exaggerating, absolutizing, and catastrophizing their perceptions. Therefore, systematic desensitization therapy, or exposure therapy and other behavioral and cognitive therapies should be used to help patients rebuild their cognitive system to achieve the purpose of treatment. Drug therapy can be improved with anti-anxiety drugs or antidepressants. Such as the more commonly used lorazepam, alprazolam, tandospiroxone, buspirone, etc. or paroxetine, sertraline, fluoxetine and other antidepressants can achieve good therapeutic effects.