Objective To explore the correlative factors of mental disorder in patients with head injury. Methods 255 subjects sustained with head injury and survived from traffic accident in Chengdu were assessed with Structured Clinical Interview for DSM-Ⅳ axis Ⅰ disorders (SCID-I/P) , Personality Disorder Questionaire for CCMD-2-R(PDQC), Structured Clinical Interview for CCMD-2-R(SCICP), WAIS-RC, WMS, brain electric activity mapping (BEAM) after completion of clinical management. Based on the diagnostic criteria of organic mental disorder in CCMD-3, mental disorders in 255 subjects were diagnosed. Results The incidence of mental disorders in the patients with head injury was 72.5% (185/255). Mental disorders in patients with head injury were correlated with educational level, type and severity of the head injury, or injuries involving the left frontal lobe injury, the left temporal lobe or multiple lobes and BEAM abnormality. Conclusion The incidence of mental disorder is high in the patients with head injury. Educational level, type and severity of the head injury, the location of the injured brain, injury involving multiple lobes of the brain may affect morbidity of mental disorders in patients with head injury.