Sequencing batch reactor (SBR) and anaerobic/anoxic/oxic(A²O) reactor were fed with different chloride concentrations (150, 500, 1000, 1500, 2500, and 5000 mg/L) to investigate the effect of influent chloride concentration on organics and nutrients removal. The COD removal efficiency decreased linearly from 96.4 and 94.8% to 48.4 and 63.0% for SBR and A²O process, respectively, with the chloride concentration increasing from 95 to 5000 mg/L. The obvious effect of influent chloride concentration on nitrification process was not observed in A²O reactor, while a sharp increase of effluent NH₃-N concentration to 2.4 mg/L was detected in SBR process when the influent chloride concentration increased to 5000 mg/L. Regarding the phosphorus removal, the effluent TP concentration started to increase when 1500 mg/L chloride was introduced into the influent for both processes. However, more severe effect was observed in A²O reactor, without any phosphorus removal at 2500 and 5000 mg/L chloride, while the TP removal efficiency gradually decreased from 86.0 to 57.5% when the chloride concentration increased from 1500 to 5000 mg/L in SBR.