We　report　the　conductance　and　average　current　through　a　triple-quantum-dot　interferometer　coupled　with　two　ferromagnetic　leads　using　the　nonequilibrium　Green＇s　function.　The　results　show　that　the　interference　between　the　resonant　process　and　the　non-resonant　process　leads　to　the　formation　of　Fano　resonance.　More　Fano　resonances　can　be　observed　by　applying　a　time-dependent　external　field.　As　a　Zeeman　magnetic　field　is　applied,　the　spin-up　electron　transport　is　depressed　in　a　certain　range　of　electron　energy　levels.　A　spin-polarized　pulse　device　can　be　realized　by　adjusting　the　spin　polarization　parameters　of　ferromagnetic　leads.　Moreover,　the　I-V　characteristic　curves　show　that　under　the　influence　of　Fano　resonance,　the　spin　polarization　is　significantly　enhanced　by　applying　a　relatively　large　reverse　bias　voltage.　These　results　strongly　suggest　that　the　spin-polarized　pulse　device　can　be　potentially　applied　as　a　spin-dependent　quantum　device.