Abstract: Nectarine flowers were cultivated with 0, 5, 15, 25, 45, 80mg/L exogenous salicylic acid (SA) liquid in zero temperature. The results showed that: pistil shape of nectarine flowers was destroyed seriously, electrolyte exosmosis rate and the content of Malondialdehyde (MDA) increased, activities of superoxide dismutase (SOD) and peroxidase (POD) decreased. Treated with 5~80mg/L SA, destroyer of nectarine flowers were faint, electrolyte exosmosis rate and the content of MDA decreased obviously. Treatments with 5~25mg/L SA resulted the activity of SOD increased, but 45~80mg/L SA made it decreased obviously. Activity of POD was higher only at 25mg/L. The best effect concentration in all of the treatments was 25mg/L SA.