With the rapid development of Internet, the complexity of the network and control difficulty has increased dramatically. For the problem of fossilization network is more and more prominent, SDN (Software Defined Network) arises at the historic moment. Due to SDN controller centralized control and the characteristics of shunt on SDN network equipment, this paper puts forward that part of nodes in the traditional network are changed to SDN nodes. In a hybrid SDN scenario, a new bi-level programming model in view of the virtual network by SDN nodes is proposed for traffic engineering algorithm.