Abstract: Objective To examine the situation of health knowledge and behavior and its influencing factors among medical university students,and to provide a reference to health education among college students.Methods With stratified cluster random sampling,990 students from a medical university in Tianjin were selected to participate in an investigation about health knowledge and behaviors.SPSS 13.0 was used to perform data analysis.Results The average scores of health knowledge and health behaviors were 63.34±15.15 and 65.55±12.67,respectively,with the pass rates of 64.4% and 71.1%.Among the students,the five lowest formation rates of health behaviors were persistent aerobic exercise of 30-60 minutes three times in a week(28.8%),intake of 200-300 g milk/dairy products everyday(33.1%),having breakfast everyday(37.7%),opening the window for ventilation everyday(52.9%),and having light and low-salt diet(54.7%).Multi-factor logistic regression analysis showed that the influencing factors of health knowledge were grade,native place and health behavior,of which grade was much closely related to health knowledge,with the odds ratio(OR)of 7.452 for grade three and the OR of 7.440 for grade five.While the influencing factors of health behavior were sex,familial education level and health knowledge,of which health knowledge was much closely related to health behavior(OR=4.869).Conclusion The situation of health knowledge and behaviors among medical university students is not optimistic.Medical universities should perform health education among students.