Objective:To investigate the orthodontic needs and to analyze the influencing factors of orthodontic treatment of university students in Xi'an.Methods:The orthodontic questionnaire survey was conducted in university students by stratified cluster random sampling,the Dental health component(DHC)and aesthetic component(AC)in the orthodontic treatment needs index were used as the objective indicators of orthodontic treatment needs,and the self-perceived aesthetic component(SAC)of the subjects was used as the subjective indicator of the need for orthodontic treatment.Univariate and multivariate logistic regression analysis were used to determine the influencing factors of university students'willingness to orthodontic treatment.Results:A total of 1135 university students were sur-veyed,including 578 males and 557 females.There were 224(19.74％),184(16.21％)and 120(10.57％)university students who required orthodontic treatment by DHC,AC and SAC analysis,respectively.Among the 224 university students who needed orthodontic treatment by DHC,68(30.36％)were willing to undergo orthodontic treatment,and 156(69.64％)were unwilling.Univariate and multivariate logistic regression analysis showed that gender,malocclusion,cognitive situation and social environment were independent influencing factors affecting the treatment intention.Conclusion:The objective orthodontic demand of Xi'an university students is high,but the demand for subjective orthodontic treatment is low.Gender,malocclusion,cognitive situation and social environment are the in-dependent influencing factors of university students'orthodontic treatment intention.