Abstract: Objective: To survey the caries conditions of Qin people lived in late Warring States Period and to search the attack rate and growing trend of caries. Methods: The decayed teeth of 111 ancients unearthed at Podi site of Gaoling, Xi'an were observed, recorded and counted. A total of 1633 teeth were counted by statistical analysis technique via SPSS 21.0. Results: Prevalence rate of Podi people was 33.33%, of which males' prevalence rate was 36.67% and female's was 27.91%. Dental caries rate was 3.12% and total DMFT was 1.38. Conclusion: Attack rate of caries is correlated with age. Prime and middle age are high-incidence season of caries. Prevalence rate of primary-age group is 46.30%, and the middle age group is 45.00%. Dental caries rate of primary-age group is 4.64% and the middle age group is 4.71%. The morbidity of caries for different teeth is M2＞M3＞M1＞M2＞M3＞M1＞P2＞P1＞C1＞P1＞P2. Caries attack rate of lower jaw is higher than that of upper jaw (3.32%>2.89%). From the aspect of attack location, proximal caries has the highest morbidity (66.67%), then buccal labial surface caries (17.65%) and occlusal surface caries (13.73%), and tongue palatal surfaces caries has the lowest morbidity (1.96%).

Key words: Xi-an , Podi site , Caries , Attack rate