A bandwidth adjustment method, characterized in that the method comprises: Obtaining, by a bus controller, a first frequency and a first channel number, wherein the first frequency and the first channel number are a target frequency and a target channel number that need to be adjusted, respectively; Sending, by the bus controller, a bandwidth negotiation request carrying the first frequency and the first channel number to a bus controller of a first peer end to determine whether or not the bus controller of the first peer end is capable of controlling a physical component of the first peer end to receive data via a channel corresponding to the first channel number according to the first frequency; and Receiving, by the bus controller, a negotiation result sent by the bus controller of the first peer end and controlling the physical component to transmit data according to the negotiation result; wherein the controlling, by the bus controller, the physical component to transmit data according to the negotiation result further comprises: when the bus controller determines, according to the negotiation result, that the bus controller of the first peer end is capable of controlling the physical component of the first peer end to receive data via the channel corresponding to the first channel number according to the first frequency, controlling, by the bus controller, the physical component to transmit data via the channel corresponding to the first channel number according to the first frequency; or when the bus controller determines, according to the negotiation result, that the bus controller of the first peer end is not capable of controlling the physical component of the first peer end to receive data via the channel corresponding to the first channel number according to the first frequency, controlling, by the bus controller, the physical component to transmit data continually via channels corresponding to a current first channel number according to a current operating frequency. Obtaining, by a bus controller, a first frequency and a first channel number, wherein the first frequency and the first channel number are a target frequency and a target channel number that need to be adjusted, respectively; Sending, by the bus controller, a bandwidth negotiation request carrying the first frequency and the first channel number to a bus controller of a first peer end to determine whether or not the bus controller of the first peer end is capable of controlling a physical component of the first peer end to receive data via a channel corresponding to the first channel number according to the first frequency; and Receiving, by the bus controller, a negotiation result sent by the bus controller of the first peer end and controlling the physical component to transmit data according to the negotiation result; wherein the controlling, by the bus controller, the physical component to transmit data according to the negotiation result further comprises: when the bus controller determines, according to the negotiation result, that the bus controller of the first peer end is capable of controlling the physical component of the first peer end to receive data via the channel corresponding to the first channel number according to the first frequency, controlling, by the bus controller, the physical component to transmit data via the channel corresponding to the first channel number according to the first frequency; or when the bus controller determines, according to the negotiation result, that the bus controller of the first peer end is not capable of controlling the physical component of the first peer end to receive data via the channel corresponding to the first channel number according to the first frequency, controlling, by the bus controller, the physical component to transmit data continually via channels corresponding to a current first channel number according to a current operating frequency. when the bus controller determines, according to the negotiation result, that the bus controller of the first peer end is capable of controlling the physical component of the first peer end to receive data via the channel corresponding to the first channel number according to the first frequency, controlling, by the bus controller, the physical component to transmit data via the channel corresponding to the first channel number according to the first frequency; or when the bus controller determines, according to the negotiation result, that the bus controller of the first peer end is not capable of controlling the physical component of the first peer end to receive data via the channel corresponding to the first channel number according to the first frequency, controlling, by the bus controller, the physical component to transmit data continually via channels corresponding to a current first channel number according to a current operating frequency.