A virtual network (VN) realization method and system are provided. The method includes setting a VN-AP in a data center network and/or a broadband network. A service deployment and management function entity receives a VN service request from a user to generate feature information of the VN; a PC/VM automatically discovers the VN-AP, the automatically discovered VN-AP generates the VN forwarding table entry of the PC/VM after the PC/VM passes the identity authentication of the VN, and performs tunnel encapsulation according to the VN forwarding table entry to forward a packet from the PC/VM. By discovering a VN-AP for processing a VN automatically, the disclosure realizes the automatic and rapid deployment of the VN.