Abstract: According to the high ammonia nitrogen concentration characteristics of the external drainage in a gold mine,the hybrid membrane bioreactor system (HBMR) is used for treatment.When the pH in the aerobic zone is weakly acidic and neutral,the operation of HMBR on the removal characteristics of typical pollutants such as ammonia nitrogen and COD was studied.The optimum process parameters of HMBR were proved by experiments:pH control of HMBR aerobic zone was 6.80-7.20,DO was 2-3 mg/L,and dynamic aeration operation cycle was 6 min (running-intermittent time:4 min-2 min),the online chemical cleaning measures are "citric acid+water-sodium hypochlorite",and the system HRT is 2.34 d.Ammonia nitrogen and COD in the HMBR outflow meet the first-grade requirements of the GB 8978—1996 Integrated Wastewater Discharge Standard.The study provides data support for the industrial application of HMBR ammonia nitrogen wastewater treatment.