The effect of membrane lipid peroxidation and activity of oxygen scavenging enzymes of Polygon sibricummaterial of Polygon sibricum was studied under different NaHCO3 concentration and time. The results indicated there was the terminally notable relationship between NaHCO3 concentration and activity of activities of catalase(CAT), malondialdehyde(MDA) contents and the permeability of plasma; the notable relationship between NaHCO3 concentration and superoxide dismutase (SOD), no significant relationship between NaHCO3 concentration and peroxides (POD); Under different concentration of NaHCO3 stress, the activities of SOD and CAT, MDA content and had terminally notability difference, POD and the permeability of plasma had notability difference; under different time of NaHCO3 stress, the activities of SOD and CAT had terminally notability difference, the activities of POD, MDA and the permeability of plasma had notability difference.