To provide a method for economically producing 6-8C aromatic hydrocarbons such as BTX i.e. benzene, toluene and xylene from heavy oil, and to provide an economically advantageous process.

Naphthalene or alkylnaphthalene included in raw materials including LCO is converted into tetralin or alkyltetralin by hydrogenated one-side nuclear hydrogenation in the presence of hydrogen; and hydrogenation ring-opening reaction, hydrogenation dealkylation reaction and transformer alkylation reaction of tetralin or alkyltetralin are performed under a certain hydrogenation condition to efficiently produce 6-8C aromatic hydrocarbons.