Abstract: An experiment study on landfill leachate treatment using Fenton's reagents has been introduced. The effect of operating conditions such as reaction time, pH, H2O2 to Fe(II) ratio (W/W) and temperature on the efficacy of Fenton process was investigated. The monitored sample taken from the Chang Sheng bridge landfill site in Chongqing city-China, has its concentrations of COD, BOD5 and NH3-N about 1500, 75 and 920 mg L-1, respectively. The oxidation of organic materials in the leachate is pH dependent and the optimal pH is 3.0. The favorable H2O2:Fe(II) ratio is 2.5:1 and the COD removal rate increased with the increase of Fenton dosage at the favorable H2O2:Fe(II) ratio.