Objective: To explore the effects of family dietary behavior and dietary structure on overweight/obesity in children aged 6-12 years in Huangdao District of Qingdao City, and to provide a basis for formulating regional intervention strategies. Methods: From October 2023 to February 2024, children aged 6-12 years old in Huangdao District of Qingdao City who came to Qingdao Huangdao District Central Hospital for physical examination were selected as the research objects, and the data were collected by questionnaire survey. The questionnaire included general demographic indicators, basic physical indicators, family factors and dietary survey. Results: A total of 560 valid questionnaires were obtained, with overweight accounting for 17.1%(95/560) and obesity accounting for 22.1%(124/560 ). The proportion of boys in overweight and obesity groups was significantly higher than that in normal group(P＜0.05). Among them, the proportion of mothers with college degree or above and the proportion of nuclear families in the overweight group were higher than those in the normal group(P＜0.05). In terms of family eating behavior, the number of eating out ≥2 times and the number of meals before bedtime in the overweight and obese group were significantly higher than those in the normal group(P＜0.05); the proportion of regular breakfast decreased, and the proportion of regular breakfast in the normal group was significantly higher than that in the obese group(P＜0.05); the sleep duration of the three groups was insufficient, and the number of children with sleep time >10 h per night on the rest day in the obese group was significantly lower than that in the normal group(P＜0.05). In terms of dietary factors, compared with the normal group, the average weekly intake frequency of pancakes/deep-fried dough sticks/deep-fried dough sticks, buns/dumplings/wontons in cereals, processed meat products in meat, carbonated drinks, biscuits/cakes and puffed food in other categories in the overweight and obese groups were higher(P＜0.05). The average weekly intake frequency of tubers in the obese group was significantly lower than that in the normal group, while the intake frequency of livestock meat and Western fast food was higher than that in the normal group(all P＜0.05). Conclusion: The proportion of overweight and obesity in children in Huangdao District of Qingdao City is relatively high. In addition to being related to their own gender, it is also closely related to the type of core family structure, the frequency of eating out, pre-bedtime meals, lack of sleep and high-calorie dietary intake. Interventions should focus on changing family lifestyles and cultivating children′s healthy dietary habits.