A method for configuring a power consumption parameter, comprising: receiving, by a relay device, an expected value of a power consumption parameter of a terminal device; receiving, by a core network control plane device, an expected value of a power consumption parameter of a relay device and the expected value of the power consumption parameter of the terminal device; determining, by the core network control plane device, a configured value of the power consumption parameter of the relay device and a configured value of the power consumption parameter of the terminal device based on the expected value of the power consumption parameter of the relay device and the expected value of the power consumption parameter of the terminal device; comprising determining, by the core network control plane device, the configured value of the power consumption parameter of the terminal device based on the expected value of the power consumption parameter of the terminal device; and determining, by the core network control plane device, the configured value of the power consumption parameter of the relay device based on the expected value of the power consumption parameter of the relay device and the configured value of the power consumption parameter of the terminal device; and sending, by the core network control plane device, the configured value of the power consumption parameter of the relay device and the configured value of the power consumption parameter of the terminal device to the relay device; receiving, by the terminal device, a configured value of the power consumption parameter of the terminal device from the relay device; and setting, by the terminal device, the power consumption parameter of the terminal device based on the configured value, or releasing a connection between the terminal device and the relay device; characterised in that when a quantity of terminal devices is greater than 1, the power consumption parameter comprises the PSM activation time, a configured value of PSM activation time of the relay device is greater than or equal to a largest one of configured values of PSM activation time of the terminal devices, and the configured value of the PSM activation time of the relay device is greater than or equal to an expected value of the PSM activation time of the relay device; and/or the power consumption parameter comprises the periodic location update timer duration, a configured value of periodic location update timer duration of the relay device is less than or equal to a smallest one of configured values of periodic location update timer duration of the terminal devices, and the configured value of the periodic location update timer duration of the relay device is less than or equal to an expected value of the periodic location update timer duration of the relay device. receiving, by a relay device, an expected value of a power consumption parameter of a terminal device; receiving, by a core network control plane device, an expected value of a power consumption parameter of a relay device and the expected value of the power consumption parameter of the terminal device; determining, by the core network control plane device, a configured value of the power consumption parameter of the relay device and a configured value of the power consumption parameter of the terminal device based on the expected value of the power consumption parameter of the relay device and the expected value of the power consumption parameter of the terminal device; comprising determining, by the core network control plane device, the configured value of the power consumption parameter of the terminal device based on the expected value of the power consumption parameter of the terminal device; and determining, by the core network control plane device, the configured value of the power consumption parameter of the relay device based on the expected value of the power consumption parameter of the relay device and the configured value of the power consumption parameter of the terminal device; and sending, by the core network control plane device, the configured value of the power consumption parameter of the relay device and the configured value of the power consumption parameter of the terminal device to the relay device; receiving, by the terminal device, a configured value of the power consumption parameter of the terminal device from the relay device; and setting, by the terminal device, the power consumption parameter of the terminal device based on the configured value, or releasing a connection between the terminal device and the relay device; characterised in that when a quantity of terminal devices is greater than 1, the power consumption parameter comprises the PSM activation time, a configured value of PSM activation time of the relay device is greater than or equal to a largest one of configured values of PSM activation time of the terminal devices, and the configured value of the PSM activation time of the relay device is greater than or equal to an expected value of the PSM activation time of the relay device; and/or the power consumption parameter comprises the periodic location update timer duration, a configured value of periodic location update timer duration of the relay device is less than or equal to a smallest one of configured values of periodic location update timer duration of the terminal devices, and the configured value of the periodic location update timer duration of the relay device is less than or equal to an expected value of the periodic location update timer duration of the relay device.