Abstract: Several feasible techniques for the treatment of ammonium nitrogen wastewater are reviewed and compared，their application conditions，ammonium nitrogen removal efficiency and treatment costs are discussed. Through analyzing the removal efficiencies and costs of various techniques，this review is aiming to provide a shortcut reference for the research and application of ammonium nitrogen wastewater treatment，which may give helps in rapidly finding a most economical，reasonable and cost-effective method or combination in practical application in different type of wastewater treatment. Through analysis and comparison，it was found that techniques of biological treatment and ammonia stripping for treating ammonium nitrogen wastewater have the lowest costs，which are 2—20 and 1.8—10 yuan/kg NH4+-N，respectively; the technique of MAP precipitation has the highest cost，which is around 50—70 yuan/kg NH4+-N; and the cost of breakpoint chloride method is about 37.6 yuan/kg NH4+-N，which is in between the above.