The　impacts　of　recycling　filter　backwash　water(FBWW)　blended　with　corresponding　raw　water　W1(simulated　water)and　W2(＇Longtan＇　lake　water)on　specific　bulk　water　parameters,　i.　e.　DOC,　UV254　and　specific　ultraviolet　absorbance(SUVA)removal　were　evaluated　in　coagulation-sedimentation　processes.　Fluorescence　characteristics　of　dissolved　organic　matter(DOM)in　source　waters,　FBWWs　and　treated　water　were　identified　and　compared.　As　compared　with　control　trial　without　FBWW,　three　volumetric　recycling　ratios　at　2%,　5%　and　8%　were　investigated.　The　results　indicated　that　fluorescent　components　in　raw　water　and　corresponding　untreated　FBWWs　DOM　were　mainly　humic-like　fluorophore(Peak　A)and　protein-like　fluorophore(Peak　T),　with　Ex/Em　wavelengths　at　245.0-265.0　nm/400.0-435.0　nm,　280.0-305.0　nm/305.0-345.0　nm,　respectively.　Additionally,　a　broad　Peak　C　with　relatively　lower　fluorescence　intensity　was　observed　in　all　fluorescence　spectra.　At　observed　recycling　rates,　organic　matter　removal　rates　in　treated　water　were　improved　with　FBWW1,　while　the　enhanced　removal　efficiencies　of　DOM　in　treated　samples　with　FBWW2　were　unconspicuous.　Fluorescence　EEM　spectra　in　the　DOM　of　treated　water　samples　were　analogous　to　those　of　source　water　accordingly.　The　process　of　recycling　FBWW　could　improve　humic-like　substances(Peak　A)　removal,　but　the　protein-like　matters　were　resistant　to　elimination　or　even　enriched　with　unvaried　structure.　The　DOM　removal　in　the　coagulation　process　of　recycling　filter　backwash　water　could　be　well　identified　by　the　three-dimensional　excitation　emission　matrix(3D-EEM)　fluorescence　technique,　therefore　it　could　be　used　in　wide　applications.　©　All　Rights　Reserved.