In this study, long-term effect of low temperature on the SNAP (Single-stage Nitrogen removal using Anammox and Partial nitritation) process treating high strength ammonia wastewater was investigated. When the concentration of ammoniumin wastewater was 2,000±20 mg/L, stable nitrogen removal was observed in the SNAP process with the ammonium and TN (total nitrogen) removal efficiencies of 96% and 85%at 10 °C, corresponding the nitrogen load of 0.1 kg N m-3 d-1. This SNAP process may have applications for treating high strength ammonia and low C/N ratio wastewater such as mature landfill leachate at low temperature (≤20 °C).