Objective To provide supporting evidence to prevention and controlling of caries in preschool children in Huangpu District(Eastern Part), by studying the influence of their habits at home on the prevalence of caries. Methods The oral health of preschool children in Huangpu District was examined, and their habits at home were recorded through survey questionnaire, including sugary diet, tooth brushing, parents′ attitude for oral health. Results Sugary diet could affect the prevalence of caries.There was no association between dental caries and times of tooth brushing.Parents′ attitude for oral health is the risk factor for the children′s caries. Conclusion Because of the higher prevalence of caries in the children in our district, effective measures should be taken.In addition, policy should consider how to ensure that children with high-risk dental caries receive adequate prevention and early care.