Post-traumatic stress disorder (PTSD) has long been clinical practice to use a three-part phased model in the treatment of trauma and the dissociative disorders. The phased treatment is an intrinsic element of the model presented throughout this article, which integrates the eye movement desensitization and reprocessing (EMDR) standard protocol and additional components: ego state therapy, attachment theory, and dissociative disorder treatment interventions. Although the researches on this model are still in its infancy, it is the current standard of care because of its efficacy with traumatized and dissociative-disordered clients.

Post-traumatic stress disorder (PTSD) is the most serious post-disaster physical and mental barrier, and intellectual disabilities are more sensitive to the negative effects caused by trauma than the healthy population. The debate existing extensively makes the diagnosis of PTSD in patients with intellectual disability difficult to be understood. There is a need to use uniform diagnostic criteria, howere, it still remains a problem for less experienced clinicians.

Identification of complex traumatic stress disorders has beyond the traditional definition of trauma and experimentally diagnostic statement of post-traumatic stress disorder (PTSD) in Diagnostic and Statistical Manual of Mental Disorders (DSM-Ⅳ-TR). Because of the disturbance of complex trauma, traumatic stress symptoms and its hurt results, it is difficult to make accurate diagnosis and effective treatment. This article began with the reasons why it was hard to define complex trauma, viewed from clinical diagnosis and treatment, discussed the importance of defining complex trauma, its multiple effects on individuals and the psychological and social factors aggravating complex trauma.