Abstract: To solve the problem of the competition for physical bandwidth between virtual networks in virtual data center, a resource allocation model was proposed based on the game theory. Firstly, an overall profit optimization objective for bandwidth allocation of virtual networks was brought forward, and then the optimization problem was split into distributed game model, which can be implemented on the switches in the network. Under the given pricing mechanism, virtual networks run a non-cooperative game which achieves optimal bandwidth allocation at Nash equilibrium point. The proof and solution of the game model were also presented. Experimental results showed that the proposed model can achieve fair and rational bandwidth resource allocation among virtual networks.