Objective To study the effect of hyperbaric oxygenation(HBO) therapy on the activities of serum SOD and CRP of patients with cerebral infarction and its clinical significance. Methods 78 patients with cerebral infarction were randomly divided into hyperbaric oxygen group (HBO Group, 40 cases)and clinical group (38 cases). The clinical group was treated with clinical conventional treatment only. HBO group was treated with HBO combined with clinical conventional treatment. 21 healthy volunteers were assigned to control group. Before and after treatment, the activities of serum SOD and CRP level were measured, and the curative effect were evaluated. Results The pretreatment serum SOD and CRP of the HBO group and clinical group were significantly different from the control group (P＜ 0. 01). Compared with the pretreatment and posttreatment serum level of the HBO group, SOD raised, CRP lowered, the difference was significant(P＜ 0. 01).Compared with clinical group, SOD raised, CRP lowered and the total cure rate of the HBO group were more significant different(P ＜0.01). Conclusion HBO therapy raised the activities of SOD and lower the level of CRP in serum of the patients with cerebral infarction, and improved the free radicals scavenging ability in the body. Therefore, HBO therapy has a good effect for cerebral infarction. The experiment suggests that the activities of SOD and CRP level in serum can be used to judge the curative effect and prognosis of HBO therapy for cerebral infarction.