Abstract: Objective To know sleeping quality and its influencing factors among university students in Tianjin.Methods Using multistage random cluster sampling and Pittsburgh Sleeping Quality Index(PSQI),the sleeping quality and its influencing factors such as gender,grade,online time,study tmie,perceived academic performance,and living environment were evaluated among 3 207 undergraduates in Tianjin city.Results The mean score of PSQI was 4.76±2.55 and the prevalence of poor sleeping was 13.22%.The cumulative logistic regression analysis showed that female (odds ratio OR=1.34,P=0.000),study tmie 8 hours per day (OR=1.47,P=0.000),study time 10 hours per day (OR=1.79,P=0.000),study time 12 hours per day (OR=2.77,P=0.000),normal self perceived learning efficiency (OR=1.90,P=0.008),bad self perceived learning efficiency (OR=2.73,P=0.000),worse self perceived learning efficiency (OR=3.29,P=0.002),and a lcohol drinking (OR=1.33,P=0.005) were the risk factors of sleeping quality.Grade 4 of college study(OR=0.79,P=0.023),per capita monthly income of household above 1 000 RMB yuan(OR=0.77,P=0.032),per capita monthly income of household above 2000 RMB yuan (OR=0.69,P=0.009) were protective factors of sleeping quality.Conclusion Sleeping quality of university students in Tianjin is lower than that of the population of same age in the country.Sleeping quality is in fluenced by many factors.Thus comprehensive measures should be taken to miprove sleeping quality among university students.