Abstract: In order to solve the problems of overheating in summer and easy accumulation of indoor pollutants in winter,a new system of Trombe wall with photothermal catalyst purification blinds is proposed,which can realize heating and formaldehyde purification in winter and purification in summer,and at the same time,it can reflect solar radiation to the outside to alleviate indoor overheating.Photothermal catalytic blinds can simultaneously use light energy and heat energy to drive catalytic purification reaction,and can also produce synergistic effect to enhance reaction efficiency. First the influence of photo/thermal catalyst with different proportions on formaldehyde degradation performance was is explored,and the formaldehyde degradation performance is carried out under different formaldehyde concentration,UV irradiation intensity and catalytic temperature conditions,revealing the photothermal synergistic purification effect under solar radiation. Then an experimental test system for the Trombe wall with photothermal catalyst purification blinds is built to explore the thermal performance and formaldehyde degradation performance of the wall under different solar irradiation intensities and turning angles of blinds. The results show that the for maldehyde removal efficiency is the best when the proportion of photothermal catalyst was 10%. Solar radiation reduces the activation energy of the photothermal composite catalyst by 14.46%-31.25%,resulting in a photothermal synergistic effect. The heating efficiency of the Trombe wall with photothermal catalyst purification blinds can reach 46.21%,and the maximum CADR is 81.47 m~3/h. Moreover,the heating efficiency and formaldehyde purification efficiency of the wall increase with the increase of solar irradiance and turning angles of blinds.