Abstract: Hydrogen, the lightest gas in the world, is widely used in filling the captive balloons in many events such as atmospheric sounding, aerial photography and holiday celebration advertising etc.However, due to the flammable and blasting performance of hydrogen, incompetently management will cause great danger.Based on a summary of the work experience of filling and flying hydrogen balloons, this paper discusses the safe risks and evasion procedures of the filling and flying process of hydrogen balloons in seven aspects, combined with the specifications, providing a reference for related work.