A traffic switching method, wherein the method comprises: establishing (101, 201) a mapping relationship between a performance parameter of a network and a forwarding node switching sequence, wherein the performance parameter of the network comprises link usage before switching and link usage after switching; when traffic switching needs to be performed, obtaining (102, 202) a current performance parameter of the network, and determining, according to the mapping relationship, a switching sequence corresponding to the current performance parameter; and delivering (103, 204) a switching instruction to forwarding nodes according to the switching sequence, so as to control the forwarding nodes to sequentially perform traffic switching, wherein the establishing (101, 201) a mapping relationship between a performance parameter of a network and a forwarding node switching sequence comprises: dividing the forwarding nodes to different switching groups, wherein each forwarding node belongs to only one switching group and wherein forwarding nodes that can be simultaneously switched are used as one switching group; determining a switching sequence of switching groups according to an increment in link usage in a switching process, wherein a sum of the increment and the link usage before switching is not greater than a preset value; and determining a switching sequence of the forwarding nodes according to the switching sequence of the switching groups, characterized in that the switching sequence of the switching groups is determined in the following manner: a target function: min Z; wherein Z represents a quantity of switching groups; and constraint conditions: • a node can be divided to only one switching group; • a switching group cannot be an empty set when a migration operation is performed; • nodes belonging to a same switching group need to satisfy a condition that is not related to a time sequence; • the migration operation needs to be continuous without a null operation, that is, each migration operation controls forwarding nodes included in one switching group to perform traffic switching; and • a quantity of switching groups is equal to a quantity of non-null migration operations. establishing (101, 201) a mapping relationship between a performance parameter of a network and a forwarding node switching sequence, wherein the performance parameter of the network comprises link usage before switching and link usage after switching; when traffic switching needs to be performed, obtaining (102, 202) a current performance parameter of the network, and determining, according to the mapping relationship, a switching sequence corresponding to the current performance parameter; and delivering (103, 204) a switching instruction to forwarding nodes according to the switching sequence, so as to control the forwarding nodes to sequentially perform traffic switching, wherein the establishing (101, 201) a mapping relationship between a performance parameter of a network and a forwarding node switching sequence comprises: dividing the forwarding nodes to different switching groups, wherein each forwarding node belongs to only one switching group and wherein forwarding nodes that can be simultaneously switched are used as one switching group; determining a switching sequence of switching groups according to an increment in link usage in a switching process, wherein a sum of the increment and the link usage before switching is not greater than a preset value; and determining a switching sequence of the forwarding nodes according to the switching sequence of the switching groups, characterized in that the switching sequence of the switching groups is determined in the following manner: dividing the forwarding nodes to different switching groups, wherein each forwarding node belongs to only one switching group and wherein forwarding nodes that can be simultaneously switched are used as one switching group; determining a switching sequence of switching groups according to an increment in link usage in a switching process, wherein a sum of the increment and the link usage before switching is not greater than a preset value; and determining a switching sequence of the forwarding nodes according to the switching sequence of the switching groups, characterized in that the switching sequence of the switching groups is determined in the following manner: a target function: min Z; wherein Z represents a quantity of switching groups; and constraint conditions: • a node can be divided to only one switching group; • a switching group cannot be an empty set when a migration operation is performed; • nodes belonging to a same switching group need to satisfy a condition that is not related to a time sequence; • the migration operation needs to be continuous without a null operation, that is, each migration operation controls forwarding nodes included in one switching group to perform traffic switching; and • a quantity of switching groups is equal to a quantity of non-null migration operations. • a node can be divided to only one switching group; • a switching group cannot be an empty set when a migration operation is performed; • nodes belonging to a same switching group need to satisfy a condition that is not related to a time sequence; • the migration operation needs to be continuous without a null operation, that is, each migration operation controls forwarding nodes included in one switching group to perform traffic switching; and • a quantity of switching groups is equal to a quantity of non-null migration operations.