1. A method for determining an intermediate routing node, comprising: determining at least one intermediate routing node that is used to transfer to-be-transmitted data between two routing nodes when there is a fault in a communication path between the two routing nodes; adding a channel dependency relationship between a to-be-verified intermediate routing node and the two routing nodes to a channel dependency graph of a routing network in which this fault has not occurred in order to enable the channel dependency graph to become an updated channel dependency graph, wherein the to-be-verified intermediate routing node is any one of the at least one intermediate routing node, wherein the channel dependency relationship is a combination of channels in which the two routing nodes perform data transmission using the to-be-verified intermediate routing node, and wherein the channel dependency graph of the routing network in which this fault has not occurred is used to describe a dependency relationship constituted by any two channels in the routing network in which this fault has not occurred, or a combination of a dependency relationship constituted by any two channels in the routing network in which this fault has not occurred and a channel dependency relationship that is established before the fault; and determining the to-be-verified intermediate routing node as a final intermediate routing node that is used to transfer the to-be-transmitted data when the updated channel dependency graph does not have a dependency relationship loop, wherein the dependency relationship loop is a loop constituted by a channel dependency relationship combination.