Iron is important general well being, to prevent or treat anemia, and is a cofactor of many enzymes in the anti- oxidant process. Effect of sodium iron ethylenediaminetetraacetate (NaFeEDTA) and ferrous sulfate on iron bio- availability and oxidative stress in anemic pregnant women was evaluated. A 2-month randomized controlled trial was conducted on 153 anemic pregnant women, with 80≤ Hb <110g/L. They were randomly allocated to three groups: group C (n=51) was the placebo control group, group I (n=51) was supplemented daily with 60 mg iron as ferrous sulfate, and group IE (n=51) with 60 mg iron as NaFeEDTA. Blood samples were collected be- fore and at the end of the intervention for measurements of hematological indices and oxidative stress parameters. Considerable increases of hematologic indicators were observed: 20.5 and 21.8 g/L for Hb (both p values <0.001); 4.81 and 7.19 μmol/L for plasma iron (both p values <0.001), 2.63 and 8.99 μg /L for ferritin (both p values <0.05) in I and IE groups, respectively, compared with the control group. Glutathione peroxidase (GSH- Px) activities increased by 32.6 and 75.3 IU/ml, and malondialdehyde (MDA) levels decreased by 0.70 and 1.12 μmol/L in I and IE groups, compared withthe C group (p values <0.05). Moreover, differences of plasma iron, ferritin and GSH-Px activity were 2.38 μmol/L, 6.36 μg /L and 42.7 IU/ml were also significantly greater in the IE group than in the I group. Moderate iron supplementation may be beneficial to improving iron deficiency and oxidative stress, and NaFeEDTA is better than ferrous sulfate.