Abstract: To study the influence of separated two-phase anaerobic fermentation leachate recirculation on anaerobic process, the equipment was developed to simulate the leachate recirculation between the two phases. The gas production performance with leachate recirculation under two reflux modes of spray and immersion was comparative analyzed, including leachate pH, VFA (volatile fatty acids) and changes in composition and their influences on gas production. And the TS gas production per unit material under the two reflux modes was calculated. The, test results showed that in the separated two-phase anaerobic fermentation process, the system had better gas production performance and stability under immersion mode of leachate recirculation, its cumulative gas production was two times than that with spray mode, the TS gas production per unit material mass was up to 217.88 mL/g.