Experiments were conducted to study the effects of Se on reducing the peroxidation damage of membrane lipin of soybean induced by continuous cropping. Results showed that Se could increase the activity of glutathione peroxidase(GSH-Px) insoybean leaves significantly in continuous cropping pot experiment and in alternate cropping plot experiment (F=13.00**and F=5.12**).Because of the increase of GSH-Px activity,the content of product of lipid peroxidation, malondialdehyde(MDA),decreased obbiouly,and there was a significant negative correlation between them,The correlation coefficients were r=-0.967**and r=-0.691**respectively.In pot experiment with continuous cropped soils,Se increased the resistance of coybean to red spiders and therefore increased soybean yield by 93.2-112.7%,F=26.35**.In alternate cropping plot experiment,Se also increased soybean yield by 12.69-14.53%,although analysis of variance shows that this was not significant.