Abstract: The design scale of leachate treatment station in a domestic waste landfill is 850 m3/d. UBF-two stage A/O external ultrafiltration-nanofiltration-reverse osmosis treatment process was adopted for leachate treatment in landfill， and high pressure reverse osmosis-evaporation process was adopted for concentration treatment. The technological process of leachate treatment and concentrate liquid evaporation system and the design parameters of main structures and equipment were introduced. Through the analysis of the actual operation data of the project for three months， the effluent water quality reached discharge standard B for surface water bodies of Integrated Discharge Standard of Water Pollutants（DB 11/307—2013）， with good economy.