We　investigate　the　photofluorescence　(PL)　of　ZnCdS/CdSe　quantum　dots　(QDs)　film　by　modulating　with　gra-phene　QDs.　The　modulated　spectra　show　a　blue　shift　from　539.86　nm　to　534.76　nm.　At　the　same　time,　the　intensity　of　fluorescence　spectrum　after　modulation　is　obviously　higher　than　that　without　modulation.　Femtosecond　transient　absorption　results　of　the　QDs　film　show　the　addition　of　graphene　QDs　can　effectively　increase　the　lifetime　of　photons　and　provide　more　energy　levels.　In　addition,　a　simple　resonator　structure　of　the　capillary　microcavity　is　designed　based　on　the　principle　of　laser　generation　and　finally　obtained　at　531.9　nm　laser　output　in　the　fluorescence　peak　of　the　ZnCdS/CdSe　QDs　in　the　experimental,　which　indicates　that　the　ZnCdS/CdSe　QDs　laser　is　feasible.　The　results　will　also　play　an　important　role　in　the　research　and　development　of　other　QDs　lasers.