Abstract: A method of generating oxygen for emergency use, wherein a mixture of solid material prepared by binding a catalyst such as the powder of manganese dioxide with a water-soluble binding agent such as a gum arabic solution and an addition compound of sodium carbonate and hydrogen peroxide is intermixed with water, so that the solid material is dissolved allowing the catalyst to gradually come into contact with a solution of hydrogen peroxide resulting from the decomposition of the addition compound of sodium carbonate and hydrogen peroxide, thereby generating oxygen gradually and continuously for an extended period of time.