In order to improve the fault tolerance ability of Wide-Area Backup Protection (WABP), under the principle of centralized distributed partition, this paper proposes a protection algorithm based on the combination of electrical quantity analysis and multi-information fusion. This method first finds the Suspected Fault Line (SFL) after sorting the bus in the partition according to the characteristics of the sequence voltage distribution. Then the regional center substation will calculate the recorded data from each sub-station to obtain the integrated sequence current of the SFL, and then use the grey correlation analysis to obtain the fault degree of SFL. At the same time, the regional center substation asks the sub-station for the IED return protection information to calculate the SFL fault degree. Finally, the two fault degrees are weighted to identify the fault location. The simulation results show that the introduction of electrical quantity can improve the fault tolerance ability of WABP, and can correctly identify the fault location under complex conditions. This work is supported by National Natural Science Foundation of China (No. 61403246).