Abstract: In order to analyze the effect of plate-type anti-arsenic-poisoning SCR denitration catalystson treating high-arsenic coal-fired flue gas of coal-fired power plant,the denitrification activities ofanti-arsenic-poisoning SCR denitration catalyst and fresh catalyst were tested. The catalyst sampleswere characterized by X-ray fluorescence ( XRF) ,N2 adsorption /desorption,X-ray diffraction( XRD)and X-ray photoelectron spectroscopy ( XPS) . The results showed that the denitrification activity of theone-year-used catalyst under 150~450 ℃ was close to that of the fresh catalyst. After one year of op-eration,the content of arsenic in the catalyst reached 3.06%,mainly in the form of As2O5. The specificsurface area of the catalyst decreased slightly. The crystal form of the support TiO2 and the content ofV4+ and Oα did not change significantly. The catalyst had no obvious physical and chemical arsenic poi-soning,showing good anti-arsenic poisoning performance. Close-