In order to treat municipal wastewater with high nitrogen and low carbon content, a certain amount of YDT elastomeric stereoscopic packing is placed in oxidation ditch and secondary sedimentation tank is equipped in oxidation ditch centre island to integrate such main experimental units as oxidation ditch, biological membrane and center island. Studied is the performance of the experimental system removing organic matters, ammonia and nitrogen from municipal wastewater with high nitrogen and low carbon content in special water quality and process conditions. In case of test temperature25℃±1℃, ammonia and nitrogen volume load of241.2 g· (m³·d) ^–1 and hydraulic retention time of 8.5 h, ammonia and nitrogen removal rate can reach 83.8% , the treated water can reach Standard A of the first class in "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant" (GB 18918-2002). Denitrifying bacteria grows slowly, its domestication time is long and 4.5 months are needed to reach the limit load.