Abstract: Abstract Objective: To study the influence of personality traits on compliance of orthodontic adults.Method:Ninety orthodontic adults aged twenty to twenty-nine were classified into the group. The subjects were assessed by using the Eysenck Personality Questionnaire-Revised, short Scale for Chinese (EPQ-RSC) and clinical compliance evaluation(CCE) form.To study the different influence of different personality traits on compliance.Results:The intro-extroversion personality has significant different on oral hygiene of orthodontic adults(P<0.05). The other two Eysenck Personality don’t have significant differents on compliance(P>0.05). Conclusion:The extroversion personality predicted good orthodontic compliance on oral hygiene.

Key words: orthodontic adults, personality traits, compliance