Abstract: Selective catalytic reduction(SCR) of NOx by CH4 over Ni/H-USY of different Ni loading and trace Pd and Pt elements used to improve the activity of a Ni/H-USY catalyst in the excess of 5% oxygen was investigated. Compared with Ni/H-USY, the Ni-Pd/H-USY and Ni-Pt/H-USY catalysts showed higher activity in a wide range of reactive temperature. A synergistic effect between Ni/H-USY and Pd element or Pt element enhanced the conversion of NO_x. Samples of the catalysts were characterized with TPR, X-ray diffraction (XRD).The addition of Pd might be responsible for the higher activity because it can produce a highly dispersed active surface area as bound-state Ni species.