Objective  To study the correlation between the mineral contents in hair and dental caries.Methods  Opisthion hair samples (about 0.5～1.0?g)of the children who underwent dental caries extraction were collected.The contents of magnesium(Mg),calcium(Ca),zinc(Zn),menganese(Mn),copper(Cu),nickel(Ni),vanaditam(V),and cadmium(Cd) were determined in the hair and the caries teeth by the method of atomic absorption spectrophotometer after cleaning, drying, and oxidized by the mixed acid of nitric acid and perchloric and the minerals concentrations were expressed as μg·g    -1.The data of the mineral contents in hair and dental caries were transferred into normal distribution by logarithm or square root transformation.The Ln(Mg), Ln(Ca), Ln(Sr), Ln(Zn), Ln(V), and Ln(Cd) in hair were considered one comprehensive factor and the square roots of Mg, Ca and V with the Ln(Ni),and Ln(Cd) in dental caries were considered one comprehensive factor.Results  The results of typical correlation study using the test of proximity normal distribution indicated there is significant correlation between the comprehensive factor in hair and that in dental caries,r=0.906.Conclusion  There are correlations between the mineral contents in hair and in dental caries.It is many elements rather than only one element that play synergistic effect or antagonistic action in the development of dental caries.