In this paper， an amine-sensitive fluorescent probe CHM was designed and synthesized using benzopyran as a fluorophore by introducing an electron-withdrawing group tricyanofuran to extended conjugated system. The probe can recognize 11 amines with an off-on fluorescence response， a large Stokes shift (120 nm)， a low detection limit (putrescine， 1.3 μmol/L) in EtOH/H2O (5/5， V/V) solution， and can imaging for putrescine in living cells. Probe CHM is loaded onto the gelatin to obtain sensing gelatin CHMGL. CHMGL shows significant color changes to volatile amines， which can be used to monitor the freshness of salmon fish in real time through colorimetric and fluorescence dual-channels， and can accurately judge the freshness of fish.