NOVELTY - Production of aliphatic and cyclic 1-25C hydrocarbons in a molecule by deoxidation of natural substances based on fatty acids, alcohols, saccharides or lipids, preferably on fats or waxes, involves mixing natural substance or mixture of natural substances with deoxidation agent in the first step, and in the second step, treating the mixture so obtained with radiation of a local gradient field of co-acting infrared and magnetoelectric radiations generated by a radiation source which is immersed in the mixture.    USE - For production of aliphatic and cyclic 1-25C hydrocarbons by catalytic deoxidation of natural substances (claimed), where hydrocarbon includes methanol used as petrol additive and ethanol; in the manufacture of alternative vehicle fuels and for other applications where petroleum-based products are used; in fuels for internal combustion engines.    ADVANTAGE - The method eliminates the drawbacks associated with the existing processes for manufacture of gaseous and liquid fuels from natural substances; is cost effective and relatively simple; and has wide practical application.    DETAILED DESCRIPTION - Production of aliphatic and cyclic 1-25C hydrocarbons in a molecule by deoxidation of natural substances based on fatty acids, alcohols, saccharides or lipids, preferably on fats or waxes, involves mixing natural substance or mixture of natural substances with a deoxidation agent in the first step, and in the second step, treating the mixture so obtained with radiation of a local gradient field of co-acting infrared and magnetoelectric radiations generated by a radiation source which is immersed in the mixture, where during the reaction, the temperature of the reaction mixture is increased due to the action of the local gradient field of the above radiations. The temperature is controlled by the intensity of the field at a value exceeding the boiling temperatures of the individual components of the products being formed, resulting in transport of the vapors above the surface of the reaction mixture, from where the products are fed to the next step of condensation and/or rectification.