Abstract: This article researched the influence of washing wastewater of different wet electrostatic precipitators to the slurry quality and the desulfurization system running using the test analysis method.This research focused on three aspects: water quality analysis,surface tension test and heavy metal content test.The results showed that Ca2+/Mg2+/Cl-concentration was high in washing wastewater,but it could not impact the ionic equilibrium of desulfurization system.The surface tension of washing wastewater was obvious lower than the slurry,which could aggravate the foaming phenomenon in the absorption tower.The heavy metal content in the washing wastewater was low,which could not affect the desulfurization system running.However,the Cr and Ni content in the washing wastewater could be very high with the polar plate corrossion,which would adversely affect the slurry quality and the desulfurization wastewater treatment system.