Abstract:The activity of peroxidase, catalase, superoxide dismutase and the content ofmalonaldehyde in panicles and anthers of P/TGMR 8902s and Petal 64s were analysed at three different developmental stages (pollen mother cell formation, V; pollen mother cell meiosis, VI;and mature anther, Vlll)during transferring from sterility to fertility. The results showed that the activity of the three enzymes in fertile pened were higher than that in sterile period. In addition, the content of malonaldehyde decreased with the increasins rate of normal pollens. It is concluded that the changes of activated oxygen metabolism in P8nicles and anthers of P/TGMR may be related to pollen abortion in P/TGMR.