The effects of NaCl pretreatments on germination percentage, germination energy, germination index and vigor index, malondialdehyde（MDA） content, activities of superoxide dismutase（SOD）, peroxidase（POD） and catalase（CAT）, ascorbate（AsA） and reduced glutathione（GSH） contents of hybrid rice Nanjing 9108 seeds under salt stress were studied. The results showed that, compared with the control group, the germination energy, germination rate, germination index and vigor index of seeds in 0.1% NaCl experimental group increased by 12.2%, 14.6%,58.3% and 120.8%, the activities of SOD and CAT increased by 65.2% and 50.2%, and the contents of AsA and GSH increased by 113.2% and 47.1% under salt stress, respectively. And the differences between the control group and 0.1% NaCl experimental group reached a significant level（P＜0.05）. The POD activity was higher than that of the control group, but there was no significant difference. On the other hand, the above germination indexes, protective enzymes activities and protective agent contents in 0.2% NaCl experimental group were significantly lower than those in control group and 0.1% NaCl experimental group under salt stress, while MDA content was significantly higher than both of groups. These results indicated that 0.1% NaCl pretreatments maybe improve the antioxidant capacity of seeds during germination period, inhibited the excessive accumulation of lipid peroxidation products, and then promoting seed germination under salt stress, which laid a good foundation for the normal growth and development of seedlings.