NOVELTY - Removing carbon, nitrogen and phosphorus in sewage, involves placing nitrite typed denitrification and dephosphorization suspension sludge and biomembrane into anaerobic-anoxic compound reactor to form carbon-nitrogen-phosphorus removing system, feeding the sewage e.g. organic carbon, ammonia nitrogen and phosphate into reactor, removing ammonia nitrogen and nitrite nitrogen in sewage, removing phosphorus during sedimentation after mud-water separation, and implementing synchronous removal of carbon, nitrogen and phosphorus.    USE - The method is useful for synergetically removing carbon, nitrogen and phosphorus in sewage (claimed).    ADVANTAGE - The method has low carbon source demand quantity and aeration energy consumption.    DETAILED DESCRIPTION - Method of synergetically removing carbon, nitrogen and phosphorus in sewage, involves (a) placing nitrite typed denitrification and dephosphorization suspension sludge and Anammox (RTM: Anaerobic ammonium-oxidizing bacteria) biomembrane into anaerobic-anoxic compound reactor to form a synergetically carbon-nitrogen-phosphorus removing system, (b) feeding the sewage including organic carbon, ammonia nitrogen and phosphate into the reactor at an earlier anaerobic stage using the nitrite typed denitrification and dephosphorization bacterium to remove organic carbon in the sewage, and decomposing and releasing the phosphate from bacterium to obtain subsequent anoxic excessive phosphorus intake, where the Anammox (RTM: Anaerobic ammonium-oxidizing bacteria) bacterium is not utilized in reaction due to deficiency of electronic receptor, and feeding the sewage including the nitric nitrogen into the reactor to provide the electronic receptor for the two bacteria and form an anoxic environment at later stage of reaction, (c) removing ammonia nitrogen and nitrite nitrogen in the sewage using Anammox (RTM: Anaerobic ammonium-oxidizing bacteria) under anoxic condition, and by using nitrite typed denitrification and dephosphorization bacterium and absorbing excess phosphate in the sewage to form rich-phosphorus sludge, (d) removing phosphorus during sedimentation after mud-water separation, running the reactor at last period, and by discharging the rich-phosphorus residual sludge, and (e) implementing the synchronous removal of carbon, nitrogen and phosphorus of the low organic-carbon high-nitrogen-phosphorus sewage based on the periodic operation of anaerobic/anoxic/sedimentation/sludge and water discharging.