ZnIn2S4　has　emerged　in　water　splitting　and　degradation　of　dyes　due　to　its　good　stability　and　light　absorption　properties.　However,　there　are　still　few　reports　of　CO2　photoreduction.　Herein,　we　successfully　synthesized　ZnIn2S4　and　obtained　a　series　of　ZnIn2S4-CdIn2S4　hetero-structured　microspheres　through　the　ion　exchange　method,　and　first　used　them　in　photocatalytic　CO2　reduction　in　noble-metal-free　systems.　The　activity　results　showed　that　these　ZnIn2S4-CdIn2S4　photocatalysts　exhibit　excellent　catalytic　activity　under　visible　light,　and　the　best　CO　yield　is　as　high　as　33.57　mu　mol.h(-1)　with　a　selectivity　of　91%.　Furthermore,　the　stability　and　reusability　of　ZnIn2S4-CdIn2S4　was　firmly　confirmed　by　diverse　characterizations,　including　X-ray　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS),　energy-dispersive　X-ray　spectroscopy　(EDX)　and　N-2　adsorption　measurements.