A process for producing aromatics, comprising the steps of a1) and b1) or comprising the steps of a2), b2) and c2): a1) a step of contacting a compound having a lactone group with an decarboxylation and dimerisation catalyst, under conditions for decarboxylation and dimerisation reaction, to produce a C8 olefin; and b1) a step of contacting the C8 olefin with an aromatization catalyst under aromatization reaction conditions, to produce aromatics, or a2) a step of contacting a compound having a lactone group with an decarboxylation catalyst, under decarboxylation reaction conditions, to produce a C4 olefin; and b2) a step of contacting the C4 olefin with a dimerisation catalyst, under dimerization reaction conditions, to produce a C8 olefin; and c2) a step of contacting the C8 olefin with an aromatization catalyst under aromatization reaction conditions, to produce aromatics, wherein, the compound having a lactone group has the structural formula: in formula, R 1 is selected from the group consisting of optionally substituted C 1-20 linear or branched alkylene, optionally substituted C 2-20 linear or branched alkenylene, optionally substituted C 2-20 linear or branched alkynylene, optionally substituted C 3-20 cycloalkylene and optionally substituted C 6-20 arylidene, preferably selected from the group consisting of optionally substituted C 2-10 linear or branched alkylene and optionally substituted C 2-10 linear or branched alkenylene, more preferably C 2-5 linear or branched alkylene, further preferably 1,2-ethylidene; and R 2 is selected from the group consisting of hydrogen, optionally substituted C 1-20 linear or branched alkyl and carboxyl, preferably selected from the group consisting of hydrogen and optionally substituted C 1-10 linear or branched alkyl, more preferably selected from the group consisting of hydrogen and C 1-4 linear or branched alkyl, wherein the decarboxylation and dimerisation catalyst is one or more selected from the group consisting of acidic oxide, oxide of bismuth, strongly acidic cation exchange resin, molecular sieve, solid super acid and composite metal oxide; the decarboxylation catalyst is one or more selected from the group consisting of acidic oxide, strongly acidic cation exchange resin, molecular sieve, solid super acid and composite metal oxide, preferably one or more selected from the group consisting of acidic oxide, strongly acidic cation exchange resin and solid super acid, more preferably one or more selected from the group consisting of strongly acidic cation exchange resin and solid super acid; the dimerisation catalyst is one or more selected from the group consisting of acidic oxide, oxide of bismuth, strongly acidic cation exchange resin, molecular sieve, solid super acid and composite metal oxide, preferably molecular sieve; the aromatization catalyst is one or more selected from the group consisting of molecular sieve, solid super acid and composite metal oxide, preferably molecular sieve, in particular ZSM-5 or M/ZSM-5, wherein M is selected from the group consisting of Zn, Ga, Sn or a combination thereof, and wherein the acid strength D1 of the decarboxylation and dimerisation catalyst and the acid strength D2 of the aromatization catalyst satisfy the following formula, D 1 > D 2 or alternatively, the acid strength D11 of the decarboxylation catalyst, the acid strength D12 of the dimerisation catalyst and the acid strength D2 of the aromatization catalyst satisfy the following formula, D 11 > D 2 > D 12 a1) a step of contacting a compound having a lactone group with an decarboxylation and dimerisation catalyst, under conditions for decarboxylation and dimerisation reaction, to produce a C8 olefin; and b1) a step of contacting the C8 olefin with an aromatization catalyst under aromatization reaction conditions, to produce aromatics, a2) a step of contacting a compound having a lactone group with an decarboxylation catalyst, under decarboxylation reaction conditions, to produce a C4 olefin; and b2) a step of contacting the C4 olefin with a dimerisation catalyst, under dimerization reaction conditions, to produce a C8 olefin; and c2) a step of contacting the C8 olefin with an aromatization catalyst under aromatization reaction conditions, to produce aromatics,