Abstract: Through simulative experiment,operation modes such as heating leachate before its recirculation,having a microorganism inoculation,adopting various leachate recirculation rate are compared and their influences on the character of bioreactor landfill leachate are studied.It is shown that leachate heating before its recirculation and microorganism inoculation assist in quickening the decline of leachate COD concentration in bioreactor landfill,while low leachate recirculation rate makes for fast generating methane.