Abstract: In this paper, c0ntents of NO and SOD in patients with cerebral infarction were detected respectively, which were detected by method of ELISA or colorimetry, The results show that contents of NO in patients with cerebral infarction at acute stage are increased remarkably than that at convalescent stage and than that of controls. But contents of SOD in patients with cerebral infarction at acute stage are decreased than that at convalescent and than that of controls. contents exchange of NO and its clinical significance in patients witb cerebral infarction were also studied in this paper.