A heat pump system, comprising: a main heat pump system ; and a directly expanded strong cool-heat radiation plate provided on a building surface and serving as the terminal of the main heat pump system ; wherein the directly expanded strong cool-heat radiation plate is configured to allow refrigerant in the main heat pump system to circulate therein, wherein the directly expanded strong cool-heat radiation plate comprises multiple pieces, the multiple pieces of the directly expanded strong cool-heat radiation plate are interconnected in series or in parallel, wherein a heat retaining layer and a reflecting layer are provided on the building surface , and wherein the reflecting layer is provided on an outside surface of the heat retaining layer facing indoors, and the directly expanded strong cool-heat radiation plate is fixed on the building surface by means of a bracket , wherein a decorative face is provided on a side of the directly expanded strong cool-heat radiation plate exposed to the outside, a packed layer with an enclosed cavity structure is located between the decorative face and the directly expanded strong cool-heat radiation plate , the packed layer has a cavity structure with an enclosed space defined by the decorative face , the directly expanded strong cool-heat radiation plate and peripheral structures, characterized in that a buffer plate , which is used for weakening the transfer effect of cool or heat quantity from the directly expanded strong cool-heat radiation plate to a room, is further provided in the packed layer between the decorative face and the directly expanded strong cool-heat radiation plate . a main heat pump system ; and a directly expanded strong cool-heat radiation plate provided on a building surface and serving as the terminal of the main heat pump system ; wherein the directly expanded strong cool-heat radiation plate is configured to allow refrigerant in the main heat pump system to circulate therein, wherein the directly expanded strong cool-heat radiation plate comprises multiple pieces, the multiple pieces of the directly expanded strong cool-heat radiation plate are interconnected in series or in parallel, wherein a heat retaining layer and a reflecting layer are provided on the building surface , and wherein the reflecting layer is provided on an outside surface of the heat retaining layer facing indoors, and the directly expanded strong cool-heat radiation plate is fixed on the building surface by means of a bracket , wherein a decorative face is provided on a side of the directly expanded strong cool-heat radiation plate exposed to the outside, a packed layer with an enclosed cavity structure is located between the decorative face and the directly expanded strong cool-heat radiation plate , the packed layer has a cavity structure with an enclosed space defined by the decorative face , the directly expanded strong cool-heat radiation plate and peripheral structures, characterized in that a buffer plate , which is used for weakening the transfer effect of cool or heat quantity from the directly expanded strong cool-heat radiation plate to a room, is further provided in the packed layer between the decorative face and the directly expanded strong cool-heat radiation plate . <EOS>