Abstract: ObjectiveTo understand the status and influencing factors of dietary behaviors among teenagers at school in Zhongshan City.MethodsStudents were selected from six full-time universities and middle schools in Zhongshan City by stratified cluster random sampling to conduct a survey of Questionnaire on Health related behaviors of adolescents in China.ResultsA total of 2 341 students were investigated, including 1 152 boys and 1 189 girls; 594 junior middle school students, 530 high school students, 636 vocational middle school students, and 581 university students. The percentages of unhealthy dietary behaviors of drinking beverage every day, eating dessert every day, eating fried food every day, often eating fast food, enjoying food of street vendors frequently, and dietary bias were 12.7%, 14.3%, 5.3%, 6.9%, 12.5%, 34.4%, respectively. The rates of healthy dietary behaviors of eating fruits every day, eating vegetables every day, having breakfast regularly, and drinking milk frequently were 41.1%, 73.6%, 81.2%, and 35.2%, respectively. The rates of drinking soft beverages and eating western-style fast food in male students were higher than those in female students(P<0.01 or P<0.05), while the rates of eating dessert, eating fruits every day, and having breakfast in female students were higher than those in male students(all P<0.01). Compared with boarding students, commuter students had higher rates of drinking soft beverages every day, eating fried food every day, eating western-style fast food, eating fruit and vegetables every day(P < 0.01 or P < 0.05). On the contrary, compared with the commuter students, the boarding students tended to drink milk frequently and having dietary bias(both P < 0.01). The higher the education level of the mothers, the higher the rates of healthily eating behaviors of the students who took vegetables, fruits and milk frequently(all P<0.01).ConclusionUnhealthy dietary behaviors were prevailing among teenagers at school in Zhongshan. Relevant interventions should be taken in accordance with their features to deepen teenagers' understanding of healthy dietary behavior and promote them to build healthy dietary habit.