Abstract: Objective To explore the trend of snack behavior and knowledge utilization of second grade students in Guangming District of Shenzhen in recent years and provide bases for targeted intervention of chronic disease among children in primary medical and health institutions. Methods From 2015 to 2018, the cluster random sampling method was used to select the second grade students of 6, 4, 6 and 6 primary schools in this area, and the self-designed questionnaire was used for investigation and trend analysis. Results There were 1 035 valid questionnaires which including 616 boys（59.52%） and 419 girls（40.48%）, averaged （8.10±0.73） and （7.96±0.74） years old respectivly. The most 5 popular snacks were fruits（58.94%）, bread and cake（46.76%）, jelly（35.07%）, biscuits and chips（30.34%）, and nuts（29.28%）. And the beverages were pure milk and yogurt（58.55%）, juice（39.32%）, carbonated beverages（27.15%）, herbal tea and green tea（23.77%）, and nutrition express beverages（23.19%）. According to the analysis of stratified statistics by year, there were significantly decline trends in consumption of snacks such as jelly, preserves, fried foods or barbecue and beverages such as herbal tea and green tea, functional drinks, carbonated beverages, coffee and milk tea, nutrition express beverages（P<0.05）. But the trends were increase such as fruits, bread and cake, pure milk and yogurt（P<0.05）. There were significantly increase in drinking boiled water year by year（P<0.01）. The main reasons of consumption in snacks and beverages were thirst and hunger（61.26%）, watching TV and bored （47.73%）. Furthermore, in health habits and food knowledge utilization, there were no significantly changed of trends except buying snacks to see the date of production （P<0.01）. Conclusion The trend of snack behavior and habit of second grade students in this area is generally good in these years, but targeted intervention strategies are still needed.

Key words: Primary school student, Snack, Behavior and habit, Trend