A method, a system, and an apparatus for dynamically adjusting a link, where the method includes: determining, by a transmitting end, link adjustment information according to the data traffic change when detecting a change of data traffic, where the link adjustment information contains the number of required working links; and adjusting, by the transmitting end, the number of working links on an interface of the transmitting end according to the determined link adjustment information, and sending a configuration request to a receiving end, where the configuration request includes the link adjustment information; and after receiving the configuration request, adjusting, by the receiving end, the number of working links on an interface of the receiving end according to the configuration request. In the embodiments of the present invention, data transmission on an original working link is not affected, thereby saving bandwidth and power consumption.