The　design　of　photocatalytic　supramolecular　systems　composing　of　semiconductors　and　molecular　metal　complexes　for　CO2　reduction　has　attracted　increasing　attention.　The　supramolecular　system　combines　the　structural　merits　of　semiconductors　and　metal　complexes,　where　the　semiconductor　harvests　light　and　undertakes　the　oxidative　site,　while　the　metal　complex　provides　activity　for　CO2　reduction.　The　intermolecular　charge　transfer　plays　crucial　role　in　ensuring　photocatalytic　performance.　Here,　we　review　the　progress　of　photocatalytic　supramolecular　systems　in　reduction　of　CO2　and　highlight　the　interfacial　charge　transfer　pathways,　as　well　as　their　state-of-the-art　characterization　methods.　The　remaining　challenges　and　prospects　for　further　design　of　supramolecular　photocatalysts　are　also　presented.