Objective To study the effects of mifepristone tablets on plasma corticosteroid in the full term infants with induction of labor.Methods 60 cases of full term pregnancy were randomly divided into two groups.The treatment group was 30 cases taking 50?mg·d -1 of mifepristone tablets for three days.The contrast group was 30 maternities with intravenous injection 2.5?U of oxytocin for three days.The plasma corticosteroid of 60 samples was blind randomly tested in full term infants on the third day after delivery.Results In treatment group plasma corticosteroid of 18 infants was increase,12 cases was normal.In contrast group plasma corticosteroid of 10 cases was increased and the others were normal.There was significant difference between two groups ( P <0.05).Conclusion Mifepristone tablets for induction of labor in pregnant women led to significant increase of plasma corticosteroid in the full term infants.