The salt resistance of radish seed was studied by treating with different concentration NaCl at the germination stage.Results showed that low concentration of NaCl stress treatment（≤20 mmoloL^-1） significantly promoted seed germination rate, germination potential, germination index and vigor index.The concentration of NaCl which significantly inhibited the seed germination was 100 mmol·L^-1, while that significantly inhibited the radicle growth was 80 mmoloL-1, which significantly inhibited the germ growth was 100 mmol·L^-1.The salt concentration, semi-lethal concentration and salt tolerance limit of radish seed germination were 155.02, 250.02 and 402.02 mmol·L^-1.