Abstract: Aromatic solvent naphtha was obtained by two-stage synthesis from C9 fractions from ethylene cracking with boiling range of 100～200℃ in the presence of Lewis acid as catalyst. The effect of the amount of catalyst，reaction temperature and time on the distribution and quality index of the product was investigated. Under the conditions of reaction temperature 60℃，reaction time 6 h and the amount of catalyst，1.0%（wt）complex compound of BF3 and ethylether and 1.5%（wt）AlCl3，71.1%（wt）aromatic solvent naphtha including 16.3%（wt）120#, 54.7%（wt）200# solvent naphtha and 20%（wt）petroleum resin were obtained. Adding solid alkali stopped the reaction in order to avoid producing a lot of waste water.