The invention discloses a method and a system for updating the forwarding adjacency attribute in a multilayered network. The system comprises a notification device in a service layer, a signaling transferring device in a forwarding adjacency label switching path (FA-LSP) and an attribute updating device in a head node and a tail node. The method comprises the following steps: when the path or attribute information of a link through which the FA-LSP passes is changed, notifying the head node of the FA-LSP; according to the signaling transmitted in a hop-by-hop mode between the head node and tail node of the FA-LSP, transmitting the information of the attribute of each link on the FA-LSP to the head node and the tail node; and correspondingly updating the attribute of FA by the head node and the tail node according to the received attribute information. After the method and the system are adopted, the attribute of the FA of a client layer can be updated in time when the attribute of the service layer is changed, therefore the result of path calculation carried out according to the updated FA attribute can be more accurate.