We studied the efficiency of the upflow anaerobic sludge bed filtration(UASBF) reactor in treating landfill leachate in the phases of start-up,load increase and steady function.The effects of chemical oxygen demand(COD_Cr),pH and alkalinity on the reactor running were also discussed.The results showed that the optimal temperature was(35±1)℃;pH was 6.8;COD_Cr concentration was 1000 to 1200 mg·L^-1;hydraulic retention time(HRT) was 48 h;volume load was 0.5 kgCOD_Cr·m^-3·d^-1 in the phase of start-up.The COD_Cr load of the increase and steady function phases was 10 kg·m^-3·d^-1.The removal rates for COD_Cr,NH⁴⁺-N,total phosphorus(TP) and suspended substance(SS) were 71.5%,57.5%,64.8%and 55%,respectively.