As a clean and efficient energy source, the application of hydrogen in the field of engines is gradually receiving more attention. A hydrogen jet simulation model was established based on Converge software. Then, the results of schlieren test were compared with the calculated results of model in terms of contour, jet penetration distance and jet cone angle, and the accuracy of model was verified. The effects of different injection pressures, ambient pressures and ambient temperatures on the characteristics of hydrogen jet were further analyzed. The results show that the jet penetration distance increases with the increase of injection pressure, and the incremental range decreases gradually. The jet cone angle increases with the increase of injection pressure. The height and width of Mach disk increase with the increase of injection pressure. With the decrease of ambient pressure, the jet penetration distance increases and the incremental range increases gradually. With the increase of ambient pressure, both the jet cone angle and the height and width of Mach disk decrease. With the increase of ambient temperature, the jet penetration distance increases and the incremental range decreases gradually， while the jet cone angle decreases. The height and width of Mach disk hardly change with the ambient temperature fluctuation.