Abstract:Objective：To investigate the current situation and influencing factors of overweight and obesity in preschool children in Haikou City，and to develop prevention and treatment measures to improve the situation. Methods：In the period from June to December 2022，a survey was conducted on 738 children aged 3-6 years who underwent health examinations at 10 community health service centers in 4 districts of Haikou City using a cluster sampling method. Their heights and weights were measured，and a questionnaire survey was conducted on the selectedguardians. The data was analyzed using SPSS 24.0，including chi-square tests and multiple factor logistic regression analysis. Results：The detection rates of overweight and obesity in preschool children were statistically significant（P < 0.05）when comparing different genders，maternal education level，per capita income level of the family，frequency of fresh fruit intake，and sedentary activity time. Conclusion：Further research should focus on these relevant factors and strengthen effective prevention of overweight and obesity in preschool children.