Post-traumatic stress disorder (PTSD), As disorders  in which psychological symptoms following a stressful event or trauma occurred such as war and floods, accidents, terror and comorbidity between anxiety disorders and complex nature of PTSD , We have to assessments and new treatment demands. The aim of this study was to determine "The most effectiveness of cognitive behavioral therapy in reducing symptoms of veterans with (PTSD)". The present study was semi-experimental with pre-test - post-test and control group. Among all veterans with mental psychiatric in Sadr Psychiatric hospital, 24 people diagnosed with PTSD , selected randomly and divided randomly into two experimental groups and one control group. Metacognition test (MCT) experienced in 10 sessions of metacognition ((Wales)) and mindfulness-based intervention (MBCT) experienced in 10 sessions of mindfulness-based ((William-Segal)) group. DASS-21 as a diagnostic test for anxiety, depression and stress & PCL list screening test based on DSM-5 PTSD with psychiatric diagnosis based on DSM-5 was used as evaluation tools and results were recorded. The collected data were analyzed by multivariate analysis and showed between experimental and control groups ,(MCT) scores and  (MBCT) scores  in post-test and pre-test are significant difference (≤0 / 001) and (MCT) in reducing symptoms of chronic PTSD caused by wars is more effective that with (MBCT). The total score of the experimental group significantly reduced PTSD syndrome after the test showed the control group (p≤0 / 05). The results suggest that components in (MCT) and (MBCT) in veterans with PTSD is disrupted. And the use of (MCT) patterns and (MBCT) is effective in reducing symptoms.