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The paper presents the result of the reseaching effect of hydraulic loading rates on the BOD5, NH4+, PO43- removal efficiency in the horizontal subsurface flow constructed wetland planting Scirpus grossus linn.f. In this work, two experimental models are set up for the treatment of domestic wastewater. These models are basically the same, but one model plants Scirpus grossus linn.f and the other does not, the criteria used for evaluation include: BOD5, NH4+, PO43-. These parameters met QCVN 14:2008 (type B) at the HLR = 0,83 m/day, besides, the study calculated the ability to treat BOD5, NH4+, PO43- of Scirpus grossus linn.f at each Hydraulic Loading Rate.