Abstract: Commutation failure of HVDC transmission system is common fault in inverter station, which affects the safe and stable operation of HVDC transmission project. And disturbance of AC system is one of the main causes of DC commutation failure. In this paper, the broadband electromagnetic transient voltage monitoring device was developed, and clustering and relevance analysis to the record data was carried out, and it was concluded that there was a strong correlation between the AC bus voltage transient disturbance caused by the fault and commutation failure of HVDC transmission system. Then the commutation failure suppression strategy for HVDC system based on AC bus voltage disturbance in inverter station was proposed. The simulation models according to CIGRE standard and common control and insurance system in China were established. According to the fault scanning simulation and the event simulation based on the fault recording data of commutation failures of Linfeng and Fufeng HVDC transmission projects in recent years, the strategy had a very good suppression effect on the commutation failures of HVDC transmission projects. To get better application effect, it is suggested to carry out real-time simulation according to the actual situation of different DC projects and AC power grid, and select the optimal parameter value.