This application provide a method for determining an energy-efficient route, and relate to the communications field. The method includes: acquiring a topology structure, a starting node, a target node, and traffic data of a network, where the traffic data includes a record of traffic among all nodes on the network; and calculating, according to the topology structure and the traffic data of the network by using an integer linear programming algorithm, an energy-efficient route between the starting node and the target node and reserved bandwidth corresponding to the energy-efficient route.