NOVELTY - Preparing liquefied petroleum gas, low-sulfur gas oil and aromatics from a fluid catalytic cracked oil flection, comprises: (a) distilling a fluid catalytic cracked oil fraction to separate the fluid catalytic cracked oil fraction into effluent oil and residual oil; (b) subjecting effluent oil to hydrodesulfurization; (c) subjecting aromatic hydrocarbon compound to convert into enriched aromatic hydrocarbon mixture containing benzene, toluene and xylene; (d) recovering fuel gas, liquefied petroleum gas and aromatics; and (e) subjecting residual oil to hydrodesulfurization.    USE - The method is useful for preparing liquefied petroleum gas, low-sulfur gas oil and aromatics (benzene, toluene and xylene) from a fluid catalytic cracked oil flection.    ADVANTAGE - The method provides liquefied petroleum gas, low-sulfur gas oil and aromatics efficiently produced together from a fluid catalytic cracked oil fraction containing almost no aromatics and liquefied petroleum gas, and the yield of each product can be adjusted through control of severe conditions of operation. The oil fraction obtained in the method can be supplied as a feedstock for an alkylation unit which is a satellite process of a fluid catalytic cracking unit, thus improving the entire fluid catalytic cracking efficiency, and also a fuel gas which is byproduced can be used as a feedstock for a hydrogen unit, thus maximizing the improvement efficiency.    DETAILED DESCRIPTION - Preparing liquefied petroleum gas, low-sulfur gas oil and aromatics from a fluid catalytic cracked oil flection, comprises: (a) distilling a fluid catalytic cracked oil fraction to separate the fluid catalytic cracked oil fraction into effluent oil and residual oil; (b) subjecting the effluent oil to hydrodesulfurization/hydrodenitrogenation to remove sulfur and nitrogen compounds from the effluent oil; (c) subjecting an aromatic hydrocarbon compound in the effluent oil subjected to hydrodesulfurization/hydrodenitrogenation to dealkylation, to convert the aromatic hydrocarbon compound into an aromatic hydrocarbon mixture in which benzene, toluene and xylene are enriched, and subjecting a non-aromatic hydrocarbon compound in it to hydrocracking, thus converting the non-aromatic hydrocarbon compound into a liquefied petroleum gas-enriched non-aromatic hydrocarbon mixture; (d) separately recovering fuel gas, liquefied petroleum gas and aromatics from the aromatic hydrocarbon mixture and the liquefied petroleum gas-enriched non-aromatic hydrocarbon mixture; and (e) subjecting the residual oil to hydrodesulfurization/hydrodenitrogenation, to obtain low-sulfur gas oil. An INDEPENDENT CLAIM is also included for preparing liquefied petroleum gas, low-sulfur gas oil and aromatics from a fluid catalytic cracked oil fraction, comprising: subjecting the fluid catalytic cracked oil fraction to hydrodesulfurization/hydrodenitrogenation, to remove sulfur and nitrogen compounds from the oil fraction; distilling the oil fraction to separate into the effluent oil and residual oil; step (c) and (d) as per se; and recovering the residual oil as low-sulfur gas oil.    DESCRIPTION OF DRAWING(S) - The figure shows a method of preparing liquefied petroleum gas, low-sulfur gas oil and aromatics from a fluid catalytic cracked oil flection.