ZnSe　quantum　dots　(QDs)　were　synthesised　by　the　cation-inverting-injection　method　in　aqueous　solution,　using　thioglycolic　acid　(TGA)　as　a　stabiliser,　zinc　acetate　dihydrate　(Zn(OAc)(2)center　dot　2H(2)O)　and　sodium　hydrogen　selenide　(NaHSe)　as　precursors　solution.　The　morphology　structure　and　optical　properties　of　ZnSe　QDs　were　characterised　by　transmission　electron　microscopy　(TEM),　X-ray　powder　diffraction　(XRD),　X-ray　photoelectron　spectroscopy　(XPS),　energy　dispersive　X　ray　spectrometer　(EDS),　photoluminescence　(PL)　and　UV-visible　absorption　spectra.　The　experimental　results　indicate　that　the　as-synthesised　ZnSe　QDs　with　the　average　size　of　4.1　+/-　0.2　nm　were　zinc　blende　cubic　crystal　structure　and　approximate　spherical　shape.　PL　spectra　were　mainly　the　contribution　of　excitonic　emission.　The　excitonic　emission　peak　could　be　tuned　by　changing　the　refluxing　time,　the　molor　ratios　of　Zn2+/HSe-　(n(Zn)(2+)/n(HSe)(-)　ratios),　the　concentration　of　Zn2+/HSe-　(C-Zn(2+)/C-HSe(-)　ratios)　and　pH　value.　Under　the　optimal　conditions,　the　strong　PL　peak　located　about　397　nm　and　ZnSe　QDs　with　the　fitted　average　lifetime　of　25.1　ns　reveals　the　strong　deep-blue　fluorescence.