NOVELTY - A technology for immobilizing nitrococcus-anaerobic ammonium oxidation bacteria and for treating sewage under intermediate temperature comprises nitrococcus immobilizing technology and anaerobic ammonium oxidation bacteria immobilizing technology. Nitrococcus immobilizing technology is the condition suitable for accumulation of nitrite is optimized. Anaerobic ammonium oxidation bacteria immobilizing technology refers to anaerobic ammonium oxidation bacteria group cultivated and domesticated through biological bacteria group mixing cultivation method.    USE - A technology for immobilizing nitrococcus-anaerobic ammonium oxidation bacteria and for treating sewage.    ADVANTAGE - Environment of carrier is beneficial to increment of biological cells, which can raise concentration of micro-organism that joins reaction to improve reaction efficiency; Nitrogen in waste water is removed biologically under condition that organic carbon source, acid and base neutralizing agent are not consumed; and oxygen consumption is reduced, treating temperature of sewage is reduced to 20-25 degrees C; and it has great energy-saving effect.    DETAILED DESCRIPTION - A technology for immobilizing nitrococcus-anaerobic ammonium oxidation bacteria and for treating sewage under intermediate temperature comprises nitrococcus immobilizing technology and anaerobic ammonium oxidation bacteria immobilizing technology; where technologies are combined together in anaerobic baffle board reactor at 20-25 degrees C. Concentration of nitrogen in inputting sewage is less than or equal to 100 mg/l. The middle part generates nitrite through nitrosation and the rest ammonia and nitrite perform anaerobic ammonia oxidizing reaction to generate nitrogen transgressing out of system so that nitrogen in sewage is efficiently removed under intermediate temperature. Nitrococcus immobilizing technology is the condition suitable for accumulation of nitrite is optimized. Nitrococcus group is largely cultivated in prepared culture solution. Filling prepared by macromolecule material fixes nitrococcus with bio-membrane and obtains accumulation of nitrite. Anaerobic ammonium oxidation bacteria immobilizing technology refers to anaerobic ammonium oxidation bacteria group cultivated and domesticated through biological bacteria group mixing cultivation method. Anaerobic ammonium oxidation bacteria are fixed by macromolecule material or inorganic material to form ball like granules to realize synchronous removal of ammonia and nitrite.