Effluent of wastewater treatment plant was used as primary water.The removal efficiency of NH₄⁺-N and its affecting factors had been studied through biological sand filter and quartz sand filter system.The results showed that water temperature was the most important factor,the higher temperature of the raw water,the higher removal rate of NH₄⁺-N by biological sand filter;the higher NH₄⁺-N density in primary water,the higher removal rate,and the change of NH₄⁺-N density affected removal efficiency little by biological sand filter.Under the normal temperature,when the density of COD_cr and NH₄⁺N were both higher,COD_cr density affected the removal efficiency of NH₄⁺-N apparently by biological sand filter.The removal of NH₄⁺-N by quartz sand filter was affected by the density of NH₄⁺-N in the primary water.Biological sand filter is a better craft and its removal efficiency of NH₄⁺-N is better than quartz sand filter in reclaimed water reuse engineering.The NH₄⁺-N density in effluent is lower than 5mg/L,and the quality meets reuse water quality criteria.