. This paper proposes an evaluation method for the ability of synchronous generators to improve the transient voltage stability of the receiving-end grid with multi-infeed DC and renewable energy. First, the multi-infeed transient short circuit ratio of the commutation bus and the renewable energy grid-connected bus is calculated using the transient response of the fault disturbance. Then, the weights of different faults and buses are calculated based on the transient voltage stability margin, and the comprehensive short-circuit ratio is calculated. Finally, the evaluation index system is constructed using the sensitivity of the comprehensive short-circuit ratio and the system network loss to the change of the generator power factor. Based on the subjective and objective combined weight and the improved TOPSIS based on the prospect theory, the evaluation of the ability of synchronous generators to improve the voltage stability is realized. This method can provide a theoretical basis for power system dispatching.