Abstract: Objective To describe the permanent teeth caries status of 8yearold students in urban areas of Nanjing to provide evidence for health service of caries prevention.Methods A sample of 1 163 8yeaold students from urban areas of Nanjing was chosen and their status of caries was investigated.Results The caries prevalence rate of permanent teeth was 19.86％．Mean DMFY was 0.412．The caries prevalence rate of deciduous teeth was 52.11％．Mean DMFY was 1.772．The caries prevalence rate of the first deciduous molar was the highest which consisted of 45.85％of deciduous teeth caries,followed by the second deciduous molar.The caries prevalence rate was 29.27％.And the filled was only 13.10％.Conclusions The caries prevalence rate and mean DMFT of permanent teeth is relatively high,and the filled rate is at a low level.We should strengthen and promote the oral health education and caries prevention programs.The monitoring and control for the high risk groups should be strengthened.

Key words: 8yearold students, caries, epidemiologieal investigation