In this work, we use the lower olefin produced by iron based CO2-FTS as the alkylation agent, which coupled with toluene alkylation reaction to selective synthesis of aromatics in jet fuel. Results demonstrate that this catalytic system presents high jet fuel selectivity with 70% which breaking the constraint of ASF distribution. The products distribution for catalyst functionalities packed in different manners was compared, indicating that the appropriate increase of the proximity benefits for the increase of the alkyl side chain. The H2/D2 isotope experiment demonstrates that the carbon and hydrogen atoms of the ethyl and (iso)propyl side chains in both ethyltoluene and (iso)propyltoluene come from CO2 and H2 reactant.