Human-induced harmful trace elements have attracted public attention. Particulate matter emitted by coal-fired power plants contains various trace elements. The distribution and emission of Cr, As, Se, Cd, Pb and Hg in the particulates emitted by wet flue gas desulfurization（WFGD） and wet electro staticpreci pitator（WESP）of a 600 MW ultra-low critical unit in Anhui Province were comprehensively studied, literature research, and physical and chemical analysis. The results show that the particulate matter concentrations of PM1, PM1～2.5 and PM2.5～10 emitted by coal-fired units were 0.85, 0.18and 0.02 mg/m3, respectively. The removal efficiency of WFGD for PM2.5～10 was over 95%, and WESP for particle size smaller than the removal efficiency of 2.5 μm fine particles is better than WFGD. The mass concentrations of Cr, As, Se, Cd, Pb and Hg in PM10 at the inlet of WFGD were 22.8, 0.2, 28.9, 27.7, 7.3 and 2.4 μg/m3, respectively. The distribution law of the mass concentration of each element in different graded particles showed a decreasing trend with the increase of particle size. After the particles passed through WFGD, the Se element mass concentration decreased by 70%. The mass concentration of Cr element increased by 466%. The mass concentrations of Hg and Pb elements increased by 325% and 205%, respectively. Cd and As increased by 101% and 113%, respectively. WFGD increases the mass concentration of trace elements in particulates, which are mainly concentrated in fine particulates. The mass concentrations of Cr, As, Se, Cd, Pb and Hg in PM10 at the outlet of WESP were 8.3, 0.2, 8.9, 8.2, 3.5 and 1.0 μg/m3, respectively. The mass concentration of Se element changed little, and the mass concentrations of the other five elements all decreased by about 50%.