ABSTRACT
Post-traumatic stress disorder [PTSD] is considered as one of the most prevalent disorder during the life time and can negatively influence the individual, family and social relationships of patients; so, prevention and treatment of this disorder is highly important. Eye movement desensitization and reprocessing [EMDR], psychological debriefing [PD], and imaginal exposure [IE] are some treatment but there is controversy about long effects of these treatments, especially among chronic patients. In a semi experimental study, a total of 54 adult male patients, based on Davidson scale and psychiatric diagnostic, were randomly selected, and then were divided into 3 equal therapy groups. All participants were evaluated before, after and 3 months after the treatment. Data were analyzed through the repeated variance and Duncan post-hoc tests. Psychological debriefing and eye movement desensitization and reprocessing were better than imaginal exposure in relief of chronic post-traumatic stress disorder signs and remaining the effectiveness in three months follow-up. It is concluded that all of the above methods are effective on chronic post-traumatic stress disorder and the efficacy of the therapeutic techniques would be still in force even after 3 months. Considering the importance of psychological interventions, it is necessary that such methods be taught to psychologists so that they can use them after traumatic accidents