N,N-dimethylhydroxylamine　(DMHA)　is　a　novel　salt-free　reducing　reagent　used　in　the　separation　U　from　Pu　and　Np　in　the　reprocessing　of　power　spent　fuel.　This　paper　reports　on　the　radiolysis　of　aqueous　DMHA　solution　and　its　radiolytic　liquid　organics.　Results　show　that　the　main　organics　in　irradiated　DMHA　solution　are　N-methyl　hydroxylamine,　formaldehyde　and　formic　acid.　The　analysis　of　DMHA　and　N-methyl　hydroxylamine　were　performed　by　gas　chromatography,　and　that　of　formaldehyde　was　performed　by　ultraviolet-visible　spectrophotometry.　The　analysis　of　formic　acid　was　performed　by　ion　chromatography.　For　0.1-0.5　mol　L-1　DMHA　irradiated　to　5-25　kGy,　the　residual　DMHA　concentration　is　(0.07-0.47)　mol　L-1,　the　degradation　rate　of　DMHA　at　25　kGy　is　10.1-30.1%.　The　concentrations　of　N-methylhydroxylamine,　formaldehyde　and　formic　acid　are　(8.25-19.36)　x　10(-3),　(4.20-36.36)　x　10(-3)　and　(1.35-10.9)　x　10(-4)　mol　L-1,　respectively.　The　residual　DMHA　concentration　decreases　with　the　increasing　dose.　The　concentrations　of　N-methylhydroxylamine　and　formaldehyde　increase　with　the　dose　and　initial　DMHA　concentration,　and　that　of　formic　acid　increases　with　the　dose,　but　the　relationship　between　the　concentration　of　formic　acid　and　initial　DMHA　concentration　is　not　obvious.