Abstract: In view of the problem that the regional sandby automatic switching system will not be able to realize the “petal” power supply restoration if the fault cannot be reliably isolated by protection, when fault occurs with the petal-type distribution network, a new control strategy for the regional standby automatic switching system is thereby proposed based on the idea of control strategy equation. The new control strategy actively carries out fault isolation and realizes, through information exchange between adjacent switch rooms, the “petal” function of restoring power supply and the intelligent load switching function in each switch room in case of line overload after power supply restoration. The information exchange also ensures the effectiveness of the load switching function of the safety and stability system. At the same time, this paper proposes a backup protection locked by the main protection, which solves the setting and coordination difficulty of the backup protection and the large workload during the operation of the “petal” inner closed loop. The field application has verified the effectiveness of the proposed new control strategy, which has certain reference significance for the research of the control strategy of the regional standby automatic switching system in other distribution networks.