Programmability recovery is an effective method to ensure network quality of service after node failure in Software Defined Wide Area Network (SD-WAN). To address the problem of a single form of failed node in programmability recovery, a heuristic algorithm-based primary backup controller deployment method is proposed to ensure network programmability when switches and controllers fail. When deploying primary controllers, control path reliability in the domain is measured by control path density and strength to improve path programmability in the event of switch failure. When deploying backup controllers, a certain number of adjacent primary control domains are divided into multiple backup regions, and a backup controller is deployed in these regions to establish their mapping to switches. This aim is to maximize the recoverability of offline switches and offline flows to improve the programmability of offline flows in the event of controller failure. Further, a discrete Wolf Pack algorithm with redefined intelligent behaviors is presented to tackle the placement problem of the primary and backup controllers. Experiments are conducted on four real-world network topologies, and the results show that the proposed method can reduce the impact of failed control paths in the case of switch failure and maximize the recovery of offline flows in the case of controller failure.