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The effect of K deactivation on V2O5/WO3-TiO2 and Ce-doped V2O5/WO3-TiO2 catalysts in the selective catalytic reduction (SCR) of NOx by NH3 was studied.Ce-doped V2O5/WO3-TiO2 showed significantly higher resistance to K deactivation than V2O5/WO3-TiO2.Ce-doped V2O5/WO3-TiO2 with K/V =4 (molar ratio) showed 90％ NOx conversion at 350℃,whereas in this case V2Os/WO3-TiO2 showed no activity.The fresh and K-poisoned V2O5/WO3-TiO2 and Ce-doped V2O5/WO3-TiO2 catalysts were investigated by means of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS),NH3-temperature progress decomposition (NH3-TPD),X-ray photoelectron spectroscopy (XPS) and H2-temperature program reduction (H2-TPR).The effect of Ce doping on the improving resistance to K of V2O5/WO3-TiO2were discussed.