In　this　article,　the　intermolecular　[2+2]　cycloaddition　of　1,2-dihydropyridines　was　achieved　for　the　first　time　by　visible　light-catalyzed.　A　series　of　novel　and　complex　cyclobutane　derivatives,　the　dimers　of　diethyl　1,2-diaryl-1,2-dihydropyridine-3,5-dicarboxylate,　were　synthesized　efficiently　with　visible　light　catalysts　under　the　irradiation　of　blue　LED　lamps.　The　density　functional　theory　and　time-dependent　density　functional　theory　were　used　to　elucidate　the　detailed　reaction　processes,　such　as　the　reaction　mechanism　and　the　stereoselectivity　of　cycloaddition　products.　©　2023