We　reported　herein　a　visible　light　promoted　difluoroalkylated　cascade　of　imidazoles　and　alkenes　to　afford　highly　functionalized　polycyclic　imidazoles.　This　method　features　a　direct　radical　cyclization　of　imidazoles　with　alkenes　using　BrCF2R　as　radical　sources.　The　reaction　conditions　tolerate　a　wide　range　of　substrate　scope　and　afford　the　desired　products　with　up　to　95　%　isolated　yield　under　mild　conditions.　Radical-trapping　and　light-on/off　experiments　indicated　a　photocatalytic　radical　mechanism.