Introduction: Using direct electrical stimulation of is a therapeutic technique that directly affects the spontaneous activity in the cortical regions. The aim of this study is to determine the effects of direct stimulation of the brain lining the skull (TDCS) on improving the mental health of veterans with psychiatric disorders. Materials and Methods: This study was quasi-experimental investigation with pre-test and post-test computations.  Sixteen veterans with psychiatric problems from Yasouj city were assigned randomly to experimental and control groups. The experimental group received 10 sessions of treatment. The SCL-90 questionnaire was used to collect data. All participants took part in the pre-test and post-test. Results: The results showed that the treatment with TDCS had significant therapeutic effects on mental health. Conclusion: The results demonstrated the effectiveness of treatment of TDCS on the mental health of veterans with psychiatric disorders.