A heat pump system , comprising: an outdoor heat exchanger ; and an electromagnetic heating assembly , comprising: an induction heating sheet , a heat insulation plate , and an electromagnetic induction wire coil , the induction heating sheet being in contact with the outdoor heat exchanger , the electromagnetic induction wire coil being attached to the heat insulation plate , the heat insulation plate being connected to the outdoor heat exchanger or the induction heating sheet , and the induction heating sheet being coupled with the electromagnetic induction wire coil by communication, a controller configured to carry out a control method for the heat pump system wherein the control method comprises: starting an electromagnetic heating assembly when the heat pump system is in a heating-start mode or a defrosting mode, wherein in a normal heating mode, if T is less than T 0 , and a compressor of the heat pump reaches a maximum frequency, the electromagnetic heating assembly is started; and if T is greater than or equal to T 0 , and the compressor does not reach the maximum frequency, the electromagnetic heating assembly stops heating, wherein a discharge temperature of the compressor is represented by T, and a target discharge temperature of the heat pump system is represented by T 0 . an outdoor heat exchanger ; and an electromagnetic heating assembly , comprising: an induction heating sheet , a heat insulation plate , and an electromagnetic induction wire coil , the induction heating sheet being in contact with the outdoor heat exchanger , the electromagnetic induction wire coil being attached to the heat insulation plate , the heat insulation plate being connected to the outdoor heat exchanger or the induction heating sheet , and the induction heating sheet being coupled with the electromagnetic induction wire coil by communication, a controller configured to carry out a control method for the heat pump system wherein the control method comprises: starting an electromagnetic heating assembly when the heat pump system is in a heating-start mode or a defrosting mode, wherein in a normal heating mode, if T is less than T 0 , and a compressor of the heat pump reaches a maximum frequency, the electromagnetic heating assembly is started; and if T is greater than or equal to T 0 , and the compressor does not reach the maximum frequency, the electromagnetic heating assembly stops heating, wherein a discharge temperature of the compressor is represented by T, and a target discharge temperature of the heat pump system is represented by T 0 . an induction heating sheet , a heat insulation plate , and an electromagnetic induction wire coil , the induction heating sheet being in contact with the outdoor heat exchanger , the electromagnetic induction wire coil being attached to the heat insulation plate , the heat insulation plate being connected to the outdoor heat exchanger or the induction heating sheet , and the induction heating sheet being coupled with the electromagnetic induction wire coil by communication, a controller configured to carry out a control method for the heat pump system wherein the control method comprises: starting an electromagnetic heating assembly when the heat pump system is in a heating-start mode or a defrosting mode, wherein in a normal heating mode, if T is less than T 0 , and a compressor of the heat pump reaches a maximum frequency, the electromagnetic heating assembly is started; and if T is greater than or equal to T 0 , and the compressor does not reach the maximum frequency, the electromagnetic heating assembly stops heating, wherein a discharge temperature of the compressor is represented by T, and a target discharge temperature of the heat pump system is represented by T 0 . <EOS>