Abstract: .The VPN technology is one of the development technology in recently, which is more valuable on business。MPLS network is greatly improved in tradition IP network’s disadvantage on realizing VPN technology plan,and can provide the safety guarantee same as Frame Relay/ATM network,so can fit for the VPN business demand 。This article introduces the MPLS VPN network model and principle ,analyzes two kind of the second layer VPN technology business plan basing on MPLS network ,and compare their advantage and disadvantage。 Key words: VPN;MPLS;Network