The proper utilization of hydrogen energy is an effective way to achieve large-scale and deep decarbonization in the transportation sector, which helps realize China's "carbon peaking and carbon neutrality" goals. In proton exchange membrane fuel cell systems, the hydrogen recirculation system using ejectors has advantages such as no moving parts, no external energy consumption, compact structure, reliable operation, no pollution, and low cost, etc. The performance of the hydrogen ejector, as the key component of the system, directly affects the system performance. However, the design methods for efficient hydrogen ejectors were not yet perfect. This article reviewed and summarized the design methods of hydrogen ejectors in the existing published literature, including the design of single convergent nozzle hydrogen ejectors, multi convergent nozzle hydrogen ejectors, and convergent-divergent nozzle hydrogen ejectors. Finally, the current state of hydrogen ejector design was summarized, and the future directions for improving hydrogen ejector design were pointed out.