Abstract: In order to improve quantitative reduction of the landfill leachate membrane concentrate, the nanofiltration membrane concentrate was treated by lime coagulation-submerged evaporation, and the change rule of water quality was obtained. The results showed that in the lime-coagulation treatment alone, the softening effect of membrane concentration was best when the dosage of lime was 2 g/L; with the increase of lime dosage, the pH of the membrane concentrate, and the removal rate of COD, NH₃-N, and metal ions (Fe³⁺, Mg²⁺, Al³⁺, K⁺ and Na⁺) increased. In lime coagulation-immersion evaporation synergistic treatment, when the dosage of lime was 2 g/L and the concentration ratio was 10, compared to coagulation alone, the softening effect of evaporation residue liquid was further improved, with hardness removal rate increased from 29.1% to 65.9%, COD removal rate increased from 24.1% to 41.2%, NH₃-N removal rate increased from 39% to 81.4%, and K⁺ and Na⁺ concentration increased from 4300,5860 mg/L to 36210, 48300 mg/L, respectively. That provided conducive condition for the latter resource utilization. COD concentration in the condensate decreased from 26.3 mg/L to 16.3 mg/L, and NH₃-N decreased from 2.0 mg/L to 1.4 mg/L, complying with the relevant requirements of the Control Standard for Domestic Waste Landfill (GB 16889—2008).