Abstract: A new flat plate solar combined system with heating and cooling was proposed and experimental prototype device was constructed. A traditional flat plate solar collector absorber was immersed inside adsorbent bed in the new combined system, the radiated heat about adsorbent bed at night can be solved efficiently, also the sensible heat and adsorption heat of adsorbent bed can be reused efficiently. The experimental results with quartz lamps showed that this combined heating and cooling system with 0.9 m² collector can produce 5.0 kg ice, also make the temperature of 60 kg water increase 18℃ under the condition of accepting the radiation energy of 16～18 MJ/m². The COP of this combined heating and cooling system is about 0.11～0.12, and the heating efficiency of this system is about 0.45. The structure of the flat plate combined heating and cooling system is simple and the property of this system is good. The successful experimental achievement has demonstrated an efficient way of the application of solar energy.