In order to solve the problem that the dual stack traffic can not be communicated when any protocol stack link fails in software defined wide area network, a dual stack traffic scheduling algorithm for software defined wide area network is proposed. The algorithm is based on fast rerouting mechanism. By combining segment routing over IPv6, it schedules the dual stack traffic of different parks when one of the wide area network dual stack link fails. Through the simulation in mininet, the feasibility of the algorithm is verified, and the link performance is measured by using the bandwidth measurement tool iPerf. The data shows that dual stack traffic scheduling algorithm greatly improves the quality of service and utilization rate of dual stack links between different parks.