In　recent　years,　treatment　of　landfill　leachate　is　becoming　a　hot　issue　in　the　disposal　of　municipal　solid　waste.　In　this　study,　electro-Fenton　(EF)　was　conducted　to　dispose　landfill　leachate　pre-treated　by　membrane　bio-reactor　(MBR).　The　optimum　operating　parameters　were　evaluated　by　the　orthogonal　experiment:　U　=　5.5　V,　t　=　50　min,　H2O2/COD0　=　1.5,　H2O2/Fe2+　=　2.5　and　pH　=　4.0.　Average　COD　removal　reached　93.90%　at　a　95%　confidence　level　and　voltage,　HRT　and　H2O2/Fe2+　were　found　to　significantly　affect　COD　removal.　Landfill　leachate　was　further　diluted　by　distilled　water　or　EF　effluent　with　different　dilution　ratio　and　then　followed　by　EF　treatment.　With　a　dilution　ratio　of　EF　effluent:　landfill　leachate　=　2:1,　electro-Fenton　got　the　best　treatment　performance,　whose　COD　decreased　to　36.2　mg/L,　meeting　the　effluent　discharge　standard　of　China.　The　residual　active　chlorine　species　and　oxidizing　matters　in　EF　effluent　improved　the　effect　of　following　electro-Fenton　process.　Through　analysis　of　ultraviolet-visible　spectrometry　(UV-vis)　and　three-dimensional　excitation　emission　matrix　fluorescence　spectrometry　(3D-EEM),　humic　acids,　ultraviolet　fulvic　acids,　visible　fulvic　acids　in　landfill　leachate　was　effectively　decomposed　and　the　humification　of　landfill　leachate　decreased　significantly　in　this　treatment　mode.　Comparing　with　other　reported　works,　this　treatment　obtained　high　removal　efficiency　(91.90-93.35%),　low　energy　consumption　(3.32-6.24　kWh/kgCOD)　and　low　treatment　cost　(0.853-1.418　US$/m(3)).　This　work　provided　a　new　perspective　in　the　EF　treatment　of　landfill　leachate　through　diluted　by　EF　effluent　with　suitable　dilution　ratio　and　operating　parameters.