Abstract: The stabilized landfill leachate, produced from long-term landfill process of more than 5 years, is widely recognized as the most refractory wastewater due to high concentrations of ammonia nitrogen and inorganic ions and low ratio of carbon to nitrogen (C/N). The characteristics of landfill leachate were summarized, and the principles and advantages of new biological nitrogen removal technologies, such as single reactor high activity ammonia removal over nitrite (SHARON) and partial nitrification (PN) - anaerobic ammonium oxidation (Anammox) processes, were introduced, which can significantly reduce the operating costs while increasing the nitrogen removal efficiency. Also the application of new technologies in landfill leachate nitrogen removal was stated based on literature review of home and abroad. At present, there are few researches on the application of new nitrogen removal technologies in the treatment of the stabilized landfill leachate, leaving great potential for further development. The treatment effect, the best operating conditions and the reaction mechanism need to be studied deeply.