Abstract: The utilization of clean and renewable hydrogen energy is regarded as an important way to reduce CO₂ emission, which has been highly valued over the world. The efficient conversion from electric energy to hydrogen energy and back to electric energy is one of the core technologies in the utilization of hydrogen energy. The industry requires large-scale output of more than 100 MW and highly efficient conversion from hydrogen to electric energy, but the current fuel cell technology struggles to meet the demand. Hydrogen fuel gas turbine can realize large-scale conversion from hydrogen energy to electric energy, and the conversion efficiency will increase with output power. It will be an important hydrogen to electricity technology to explore. This paper introduces the performance characteristics of hydrogen fuel gas turbine, research trends in various countries, model types and characteristics, output power and thermal efficiency, ammonia fuel gas turbine, and puts forward the idea of hydrogen energy utilization system using hydrogen fuel gas turbine to realize water to water cycle.