Centering on the Virtual Private Network (VPN) application technology in existing network, this paper firstly introduces the VPN technology based on MPLS/BGP, including the principles and main concepts of MPLS/BGP VPN technology, the MPLS VPN network architecture and the concepts of RD and RT in MPLS/BGP VPN. Based on detailed description of routing distribution and data forwarding process, this paper deeply analyzes the communication principles of MPLS/BGP VPN technology. Finally, on the basis of theory, it uses the Alcatel’s mature network device to implement the instance configuration, and gives the specific configuration ideas and approaches to effectively combine the technical principle and actual application of MPLS/BGP VPN technology, and provides some references for other network device configuration.