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Objective: To explore the expression of resistin protein in abdominal subcutaneous adipose tissue and placental tissue in pregnant women and the relationship between pregnant physiological insulin resistance (IR) and gestational diabetes mellitus(GDM). Methods: The expression of resistin protein in abdominal subcutaneous adipose tissue of pregnant and nonpregnant women and placental tissue was measured using western blotting method. Fasting serum glucose concentration was measured by glucose oxidase assay.Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were measured. Results: Resistin protein expression in placental tissue(67905 ± 8441)(arbitrary OD units)was much higher than that in abdominal subcutaneous fat tissue in pregnant women (40718 ± 3818)( P ＜0.01 ) and nonpregnant women (38288 ± 2084) ( P ＜ 0.01 ) respectively, and there was no significant difference in abdominal subcutaneous fat tissue among pregnant and nonpregnant women. Conclusion: Resistin protein expression in placental tissue is much higher than that in abdominal subcutaneous fat tissue in pregnant and nonpregnant women. Resistin protein is secreted from human placental tissue.Resistin is one of the factors which lead to pregnant physiological IR and GDM.