The present study investigated toxic impacts of domestic sewage from different treatment processes on malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT) and peroxidase(POD) in roots and leaves of Vicia faba. The results showed that SOD activities were increased at all samples both in roots and leaves of Vicia faba; CAT and POD activities were also enhanced in leaves; In roots, CAT and POD activities were enhanced at low CODCr concentrations, and were decreased at high CODCr concentrations. Except for secondary settler, MDA were significantly increased at all samples both in roots and leaves.