NOVELTY - Recovering eutrophic water body from large filamentous green algae using sediment microbial fuel cell (SMFC) system comprises e.g. selecting graphite, carbon felt and carbon cloth as one of anode, burring anode in the water channel or river sediment, selecting graphite, carbon felt and carbon cloth as one of cathode (2), attaching cathode in water channel or river channel (5), connecting cathode and an anode in series between through the wire (3) using small power uses electrical appliance or the resistance (1), taking large filamentous green algae (4) inoculating in surface of cathode.    USE - The method is useful for recovering eutrophic water body from large filamentous green algae using sediment microbial fuel cell (SMFC) system (claimed).    ADVANTAGE - The method removes nitrogen and phosphorus contents; utilizes system which has electrical efficiency; increases dissolved oxygen content in the water; avoids micro-algae bloom by filamentous green algae which generates large amount of oxygen through photosynthesis; is conducive to production and does not generate secondary pollution.    DETAILED DESCRIPTION - Recovering eutrophic water body from large filamentous green algae using sediment microbial fuel cell (SMFC) system comprises selecting graphite, carbon felt and carbon cloth as one of anode, burring anode in the water channel or river sediment, where the interface of anode surface from water channel or river is 3-10 cm, selecting graphite, carbon felt and carbon cloth as one of cathode (2), attaching cathode in water channel or inner slope surface of river channel (5), immersing completely in water body, connecting cathode and an anode in series between through the wire (3) using small power uses electrical appliance or it is electrical energy storage device or the resistance (1), taking large filamentous green algae (4) according to the seeding density of 1-10 mg/cm2, inoculating uniformly in fixed surface of cathode, where the large filamentous green algae is Cladophora, Ulothrix and/or Spirogyra.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the sediment microbial fuel cell (SMFC) system utilized in the above mentioned method.    Resistance (1)    Cathode (2)    Wire (3)    Large filamentous green algae (4)    Channel or river (5)