AC-DC hybrid half-wavelength system is an effective way to solve energy-supplying along half-wavelength. When there is a short circuit fault on the AC bus of the DC station and the fault is not removed in time, voltage along the AC system will increase and lead to the action of over-voltage protection and exitance of DC system. The valve of DC system will be also subjected to the impact of over-current. This paper proposes a method of accessing current limiting module at the DC bus to stable DC voltage by limiting the rising speed of the fault current. This way enables the AC system to continue to power the DC system under fault condition and improves the fault-crossing capability of system. Finally, the effectiveness of the method is verified by simulation.