CsPbBr3　nanocrystals　have　attracted　great　interest　owing　to　their　high　fluorescence　quantum　efficiency,　adjustable　photoluminescence　wavelength,　and　good　stability.　We　report　a　device　that　consists　of　disordered　gold　nanorods　underneath　a　film　of　CsPbBr3　nanocrystals.　Two-photon　pumping　using　femtosecond　laser　pulses　at　800　nm　enables　amplified　spontaneous　emission　(ASE)　at　about　523　nm.　In　this　work,　a　narrow　peak　with　linewidth　of　5　nm　is　observed　when　the　pump　fluence　reaches　a　low　threshold　of　0.65　mJ/cm(2).　The　results　show　that　plasmonic　resonance　of　gold　nanorods　improves　the　emission　transition　rate　and　enables　low　threshold　ASE.