A pseudowire setup method, comprising: receiving, by a node, a label mapping message which carries a bandwidth required by a service and a service availability level, wherein the service availability level is a pseudowire availability type length value obtained through mapping of service availability; judging, by the node, whether a Label Switching Path, LSP, in which the node is located supports the service availability level and the bandwidth of the service, according to bandwidth supporting information, which is stored in the node, of a LSP in which the node is located, and the bandwidth required by the service and the service availability level which are carried in the label mapping message; and using the LSP as an LSP which bears a pseudowire when judging that the LSP supports the service availability level and the bandwidth of the service, wherein the bandwidth supporting information of the LSP is the information about multiple service availability levels supported by the LSP and a remaining bandwidth quota corresponding to the multiple service availability levels, and wherein the judging, by the node, whether the LSP in which the node is located supports the service availability level and the bandwidth of the service, comprises: comparing, by the node, the obtained service availability level and bandwidth required by the service with the stored service availability level and the remaining bandwidth quota; and judging that the LSP supports the bandwidth required by the service in the service availability level when determining that the LSP supports the service availability level and the remaining bandwidth quota corresponding to the service availability level is greater than the bandwidth required by the service. receiving, by a node, a label mapping message which carries a bandwidth required by a service and a service availability level, wherein the service availability level is a pseudowire availability type length value obtained through mapping of service availability; judging, by the node, whether a Label Switching Path, LSP, in which the node is located supports the service availability level and the bandwidth of the service, according to bandwidth supporting information, which is stored in the node, of a LSP in which the node is located, and the bandwidth required by the service and the service availability level which are carried in the label mapping message; and using the LSP as an LSP which bears a pseudowire when judging that the LSP supports the service availability level and the bandwidth of the service, wherein the bandwidth supporting information of the LSP is the information about multiple service availability levels supported by the LSP and a remaining bandwidth quota corresponding to the multiple service availability levels, and wherein the judging, by the node, whether the LSP in which the node is located supports the service availability level and the bandwidth of the service, comprises: comparing, by the node, the obtained service availability level and bandwidth required by the service with the stored service availability level and the remaining bandwidth quota; and judging that the LSP supports the bandwidth required by the service in the service availability level when determining that the LSP supports the service availability level and the remaining bandwidth quota corresponding to the service availability level is greater than the bandwidth required by the service. comparing, by the node, the obtained service availability level and bandwidth required by the service with the stored service availability level and the remaining bandwidth quota; and judging that the LSP supports the bandwidth required by the service in the service availability level when determining that the LSP supports the service availability level and the remaining bandwidth quota corresponding to the service availability level is greater than the bandwidth required by the service.