Induced crystallization is employed to treat copper-containing wastewater in this study.The copper removal efficiency can be achieved to 90% when the influent copper concentration is 20 mg.L-1,50 mg.L-1,100 mg.L-1.For a 145 d experiment,it can be found a noticeable crystal growth,which can be speculated as alkaline copper carbonate [CuCO3.Cu(OH)2.xH2O)]as measured by SEM-EDS.Optimized conditions for copper removal efficiency were investigated by varying the type of chemical reagents,the molar ratio of CT to Cu,the hydraulic loading and the hydraulic retention time.The best results were obtained when the chemical reagent is Na2CO3,the molar ratio of CT/Cu is1—2,and the hydraulic loading is not higher than 25 m.h-1.