Abstract: A method for continuously decomposing ozone layer-depleting substances which comprises adding air serving as a photolytic reaction promoter to at least one member selected from the group consisting of CFCs, HCFCs, halons and halogen-containing organic solvents, subjecting the resultant mixture to irradiation with UV light, and separating the resultant solid product and the resultant halogen product from each other to render the at least one member harmless is described. The method comprises providing a refrigeration medium comprising a lubricating oil and the at least one member, separating the lubricating oil from the at least one member under normal temperature and normal pressure conditions, separating moisture to a full extent from a mixture consisting of the at least one member and air, and subjecting the mixture to photolytic reaction by irradiation with UV light, and separating and collecting the resultant halogen compound from the photolytic reaction product.