Experimental study on micro polluted water pollutant removal effect of multistage constructed wetland pond system using change by hydraulic retention time of COD，TP，turbidity，ammonia nitrogen removal effect.The experimental results show that the multilevel artificial wetland pond system for removal of ideal micro polluted water pollution in the hydraulic retention time of =5 d COD，TP，turbidity，ammonia nitrogen removal rate were 62%，75%，80%，60%.