【Objective】To investigate the impact of inhalation high concentrations of oxygen on oxidative stress in the lung tissue of the ARDS rats. 【Methods】30 healthy adult rats were used for establishing the ARDS model by injecting LPS, and the other 30 rats wereusedas normal group. Both of the rats in two groups were divided into three subgroups respectively by inhaling different concentrations of oxygen(air, 60% oxygen and 100% oxygen). After 72hours the rats were killedand the partial pressure of oxygen(PO2), ma...