The experiment conducted in the field, using the submerged macrophyte-Elodea muttallii and immobilized nitrogen cycling bacteria studied the change of nitrogen and phosphorus in eutrophicated water system in winter-spring seasons. The results show that: when we combined the two factors, the results will be more obvious to improving and maintaining the water quality. There are several forms nitrogen concentration will decrease, due to absorb by Elodea muttallii and ammonolysis and nitrification and denitrification process by nitrogen cycling bacteria. At the later of experiment, though the total phosphorus and dissolved phosphorus will increase, due to the release by sediments, combined Elodea muttallii with INCB have the obvious role to cushion the phenomenon.