The action of low-powered lasers on individual hydrocarbons and the gasoline fraction is investigated. The composition of the derived products is studied, and a hydrocarbon conversion scheme proposed. It is shown that the effect is maximum, if hydrocarbon mixtures of a complex composition are exposed to a laser. The major directions of hydrocarbon conversions are structural-isomerization, cylization, and, to a lesser extent, cracking and dehydrogenation.