Objective： To investigate the correlation between hair selenium（Se） level and gastric cancer. Methods： Atomic fluorescence spectrophotometer（AFS） was used to detect the Se level in hair. Results： The Se concentration in patients with gastric cancer ranged from 0.25 to 2.33 μg/g（0.825 ± 0.51 μg/g）， and that of health individuals ranged from 4.23 to 9.21 μg/g（6.29 ± 1.68 μg/g）. The results showed that the Se concentration in the patients’ hair was significantly lower than that in controls（P < 0.01）. Conclusion： There is a correlation between hair concentration and gastric cancer.