Objective To explore the primary teeth caries status of preschoolers in Pudong community and its relevant factors of parental knowledge-belief-practice (KBP).Methods Using stratified random cluster sampling,a total of 1 179 children from 9 kindergartens in Hudong community in Pudong new area were examined.Oral cavity check-ups and parental questionnaire survey were conduced to understand the primary teeth caries rate of preschoolers and its related influencing factors.Results The prevalence rate of primary teeth caries was 53.2％ and DMFT 2.79.The prevalence rate of primary teeth caries had statistical significance in different age groups (P ＜ 0.05).Multi-factor analysis showed that the influencing factors of primary teeth caries were age (P ＜ 0.05),parental education level (P ＜ 0.05),parental assistance of teeth brushing (P ＜ 0.05),children eating sweets before bedtime (P ＜ 0.05) and parental awareness for treating primary teeth (P ＜ 0.05).Conclusions The prevalence rate of primary teeth caries is high among the preschoolers of Pudong.And age,parental education level,parental preventive knowledge of teeth caries and poor eating habits are significant factors correlated with the incidence of dental caries in children.