Objective:To evaluate the personality and psychosocial status of adult malocclusion patients through the Eysenck Personality Questionnaire(EPQ) and the Symptom Checklist 90(SCL-90). Methods:The EPQ and the SCL-90 were administered to 348 adult respondents with Angle’s ClassⅠ,Ⅱ,Ⅲmalocclusion and normal occlusion.Personality and psychosocial traits were analyzed and compared among the groups.Results:Patients in Angle’s ClassⅠ,D andⅢgroups scored lower on the EPQ-E and higher on the EPQ-N than those in the normal occlusion group, whereas patients in the Class II group scored higher on the EPQ-P.The mean scores of ClassⅠ,ⅡandⅢgroups were significantly higher than those of the normal group on somatization, obsessive-compulsiveness,interpersonal sensitivity,depression,anxiety,and paranoid ideation. All SCL-90 scores were significantly positively correlated with EPQ-N.Psychoticiam and neuroticism scores of female respondents were higher than those of male respondents.The impact of education was greatest on the EPQ-P and the EPQ-E of adult personality,whereas the impact of deformity was greatest on the EPQ-N of adult personality.Conclusions:Personality and psychosocial status show differences in adult patients with ClassⅠ,Ⅱ,Ⅲmalocclusion and normal occlusion and can be influenced by gender,deformity,age and education. Objective: To evaluate the personality and psychosocial status of adult malocclusion patients through the Eysenck Personality Questionnaire (EPQ) and the Symptom Checklist 90 (SCL-90). Methods: The EPQ and the SCL-90 were administered to 348 adult respondents with Angle’s Class I , II, III normal occlusion and normal occlusion. Personality and psychosocial traits were analyzed and ethnic among groups. Results: Patients in Angle’s Class I, D and III groups scored lower on the EPQ-E and higher on the EPQ-N than those in the normal occlusion group , whereas patients in the Class II group scored higher on the EPQ-P. The mean scores of Class I, II and III groups were significantly higher than those of the normal group on somatization, obsessive-compulsiveness, interpersonal sensitivity, depression, anxiety, and paranoid ideation. All SCL-90 scores were significantly positively correlated with EPQ-N.Psychoticiam and neuroticism scores of female respondents were higher than those of male respondents. Impac t of education was greatest on the EPQ-P and the EPQ-E of adult personality, but the impact of deformity was greatest on the EPQ-N of adult personality. Conclusions: Personality and psychosocial status show differences in adult patients with Class I, II , Ⅲ normal occlusion and normal occlusion and can be affected by gender, deformity, age and education.