Trichloroacetamide　(TCAcAm)　is　among　of　the　nitrogenous　disinfection　by-products　(N-DBPs)　with　high　cytotoxicity　and　genotoxicity,　which　is　usually　detected　at　low　concentration　(mu　g/L)　in　drinking　water.　In　this　study,　advanced　reduction　process　(ARP)　based　on　vacuum　ultraviolet　(VUV)　was　employed　to　eliminate　TCAcAm.　Compared　with　VUV,　VUV/sulfide,　and　VUV/ferrous　iron　processes,　VUV/sulfite　process　demonstrated　excellent　performance　for　TCAcAm　decomposition,　the　higher　removal　of　TCAcAm　could　be　achieved　by　VUV/sulfite　process　(85.6　%)　than　VUV　direct　photolysis　(13.5　%)　due　to　the　production　of　a　great　number　of　reactive　species.　The　degradation　of　TCAcAm　followed　the　pseudo-first-order　kinetics　well　in　VUV/sulfite　process,　and　the　pseudo-first-order　rate　constant　(k(obs))　increased　with　increasing　sulfite　concentration.　Reactive　species　quenching　experiments　demonstrated　that　e(aq)(-),　SO3.-　and　H.　were　involved　in　the　degradation　of　TCAcAm.　The　in　situ　generated　e(aq)-,　SO(3)(.-)and　HO.　via　VUV/sulfite　process　were　identified　by　electron　paramagnetic　resonance　(EPR),　and　the　eaq-　was　proved　to　be　the　dominated　species　(relative　contribution:　83.5　%)　for　TCAcAm　decomposition.　The　second　-order　rate　constant　of　TCAcAm　with　e(aq)(-)　was　determined　to　be　2.41　x　1010　M-1　s(-1)　for　the　first　time　based　on　competitive　kinetic　method.　The　complete　TCAcAm　degradation　could　be　achieved　at　pH　＞　8.3,　while　TCAcAm　degradation　efficiency　decreased　to　11.9　%　at　pH　5.8.　TCAcAm　decay　could　be　divided　into　two　stages:　rapid　growth　(sulfite　dosage:　0.25-1.0　mM)　and　slow　growth　(sulfite　dosage:　1.0-4.0　mM).　The　yield　of　e(aq)(-)was　controlled　by　sulfite　dosage,　and　the　predict　yield　of　e(aq)(-i)ncreased　from　3.69　x　10(-14)　to　2.58　x　10(-12)　M　with　increasing　the　sulfite　dosage　from　0.25　to　4.0　mM　by　Kintecus　6.80,　which　resulted　in　an　increase　in　TCAcAm　removal.　Meanwhile,　the　presence　of　dissolved　oxygen　(DO),　chloride　(Cl-),　bicarbonate　(HCO3-)　and　humic　acid　(HA)　posed　negative　influence　on　TCAcAm　decomposition　to　various　degrees.　Dichloroacetamide　(DCAcAm),　trichloroacetic　acid　(TCAA),　dichloroacetic　acid　(DCAA)　and　Cl-　were　identified　as　intermediate　products,　indicated　that　reductive　dechlorination　and　hydrolysis　coexisted　during　the　degradation　of　TCAcAm　in　VUV/sulfite　process.