to purify aquaculture wastewater in the lab. Different nitrogen forms removed from aquaculture wastewater and the dynamic distribution of four groups of bacteria involved in nitrogen cycling, ammonifiers (itrosobacteria nitrifiers (NB) and denitrifiers (DB), were evaluated. Our results revealed that the removal efficiency of nitrogen and chemical oxygen demand () performed by the combined treatment (I+M) was significantly higher than when used separately ( removal rate by the I+M treatment reached 50.83% and 62.38 %, respectively, significantly higher than I (39.55% and 51.17%) or M (40.78% and 53.31%) separately ( than that of treatment I (48.23%four groups of bacteria on the roots surface increased in certain extent compared with treatment M, and during the last period on the ceramic surfaces showed an overall downward trend, e.g. AB Principal response curve analysis (PRC) showed that turbidity,-N, TN contribute great to total difference, during the early and middle treatment was more efficient at removing nitrogen than treatment I or M, but the overall decreased greatly in the later stage with differences between I+M and I becoming small. This purifying method has some drawbacks and therefore requires further optimization to ensure its effects are long lasting.