Background Prenatal lead and cadmium exposure will not only influence the mothers organ systems,but also will provide an environment that may influence the fetus and neonate in a harmful way.In the present study,we detected the blood lead levels (BLLS)and cadmium levels for the duration of pregnancy and 6–12 weeks after delivery and to analyze the influencing factors of BLLs in healthy pregnant women.Methods A cohort study survey was carried out.We recruited 174 healthy pregnant women without pregnancy or obstetric complications or abnormal pregnancy outcomes as the gravida group,and 120 healthy non-pregnant women as the control group.