Abstract: This paper proposes a new artificial photosynthesis（AP）system that involves a photovoltaic/thermal（PV/T）device to convert solar energy into heat and power,and the heat is supplied to adsorption-based carbon dioxide capture,and the power is supplied to the reduction reaction. This paper will build and couple the PV/T device,adsorption carbon capture,and carbon reduction reaction models. Then,the amount of captured carbon dioxide to that required by the reduction reaction process will be comparatively analyzed.Results show that MOF-74 can capture 6 times more carbon dioxide than activated carbon,so it has a better potential for carbon dioxide capture. However,when the MOF-74 adsorbent mass is higher than 50 kg,the carbon dioxide capture’s thermal efficiency decreases to below 20%. Moreover,when a 1 square meter PV/T panel with 10 solar concentrations is used,5 kg of MOF-74 can capture 0.45 kg/d of carbon dioxide,which subsequently enabled 0.152 kg/d of methane production.