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Pregnancy is a critical stimulator of bone mineral resorption.We used to find the MTHFR gene polymorphisms are related with blood lead levels among pregnant women.Pregnancy-stimulated bone tover may be associated with MTHFR gene polymorphisms too.In this article,we aimed to determine the relationship between MTHFR gene polymorphisms and bone tover rates among the pregnant women.The participants including pregnant and non-pregnant women were selected and recruited during their routine prenatal or physical examination from July to October in 2012.A total of 1000 participants,including 250 pregnant women in the first,second,and third trimesters and 250 non-pregnant women,were enrolled in the study.Finally,after excluding 27 participants unable to provide blood samples,973 eligible participants (i.e.,234,249,and 248 pregnant women in the first,second,and third trimesters,respectively,and 242 non-pregnant women)were included in the research.The MTHFR gene 1298CC homozygote carriers were more susceptible to yield higher plasma homocysteine levels than the 1298AA/AC carriers,with standardized coefficients of 0.086 (P＜0.05) and 0.104 (P＜0.01) of all the participants and the pregnant women,respectively.The MTHFR gene 1793AA homozygote carriers more likely showed higher plasma osteocalcin levels (standardized β=0.091,P＜0.01) than the 1793GG/GA carriers among all the subjects.Plasma homocysteine levels were positively correlated with blood lead levels among the participants and the pregnant women with standardized coefficients of 0.320 (P＜0.01) and 0.179 (P＜0.01),respectively.Plasma osteocalcin levels were positively associated with blood lead levels among pregnant and non-pregnant women with standardized coefficients of 0.084 (P＜0.05) and 0.125 (P＜0.01),respectively.In conclusion,homocysteine and osteocalcin contents in plasma are associated with the MTHFR gene A1298C polymorphism and blood lead levels among pregnant women.The MTHFR gene A 1298C polymorphism-related homocysteine is a possible risk factor for increased blood lead levels among Chinese women.