MPLS (Multiple Protocol Label Switching) VPN (Virtual Private Network) routing backup method and system based on wireless mode

The invention provides an MPLS (Multiple Protocol Label Switching) VPN (Virtual Private Network) routing backup method and system based on a wireless mode. The method comprises the following steps: an integrated service router receives enterprise user service data; when a fixed principal network connected with the integrated service router fails, the enterprise user service data is transmitted to a wireless standby network connected with the integrated service router; and a GGSN (Gateway GPRS Support Node) in the wireless standby network transmits the service data to the enterprise network via an IPSec (Internet Protocol Security) router which is directly connected with the GGSN. The invention can perfect the security backup mechanism of the MPLS VPN service, and prevent the backup transmission process of the enterprise user service data from getting access into the public network.