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.