There is no effective quantitative analysis method in the cumulative effect of the short circuit current which aims at key equipment (transformer, circuit breaker, etc.) in power systems. A fault short-circuit current cumulative effect analysis model based on PSD-BPA simulation procedures is presented for this condition. The model uses batch calculation for several short-circuit faults based on the fault occurrence time, the actual fault type and system operation mode. The paper presents the results of the cumulative effect of a fault in the Jiangsu power grid. Finally, it puts forward the ideas of the graphical display of application in power system. The proposed method can be used to sort the equipment according to the equipment history fault current cumulative effect, and provide early warning and maintenance of the equipment by priority strategy, which will help to improve the safe and stable operation of power grid.