A method for reducing power consumption, wherein the method is applied to a first electronic device, the first electronic device comprises a first universal serial bus USB module, and the method comprises: receiving, by the first USB module, a power-off instruction from a second USB module in a second electronic device; and performing, by the first USB module, a power-off operation according to the power-off instruction, wherein the first electronic device further comprises a first power delivery PD module and a key module, the key module is connected to the first PD module and the first USB module, and after the performing, by the first USB module, a power-off operation according to the power-off instruction, the method further comprises: converting, by the first PD module, a signal output by the key module, to obtain a PD signal when a key operation is performed on the key module; and sending, by the first PD module, the PD signal to a second PD module in the second electronic device, wherein the PD signal is used for the second electronic device to process the key operation, wherein after the receiving, by the first USB module, a power-off instruction from a second USB module in a second electronic device, the method further comprises: sending, by the first USB module, an instruction response to the second USB module, wherein the instruction response is used to indicate to the second USB module that the first USB module successfully receives the power-off instruction, wherein the second USB module powers off after the first USB module successfully receives the power-off instruction. receiving, by the first USB module, a power-off instruction from a second USB module in a second electronic device; and performing, by the first USB module, a power-off operation according to the power-off instruction, wherein the first electronic device further comprises a first power delivery PD module and a key module, the key module is connected to the first PD module and the first USB module, and after the performing, by the first USB module, a power-off operation according to the power-off instruction, the method further comprises: converting, by the first PD module, a signal output by the key module, to obtain a PD signal when a key operation is performed on the key module; and sending, by the first PD module, the PD signal to a second PD module in the second electronic device, wherein the PD signal is used for the second electronic device to process the key operation, wherein converting, by the first PD module, a signal output by the key module, to obtain a PD signal when a key operation is performed on the key module; and sending, by the first PD module, the PD signal to a second PD module in the second electronic device, wherein the PD signal is used for the second electronic device to process the key operation, wherein after the receiving, by the first USB module, a power-off instruction from a second USB module in a second electronic device, the method further comprises: sending, by the first USB module, an instruction response to the second USB module, wherein the instruction response is used to indicate to the second USB module that the first USB module successfully receives the power-off instruction, wherein the second USB module powers off after the first USB module successfully receives the power-off instruction.