This invention relates to a method of lighting heavy aromatic hydrocarbon and alkyl transfer. Mainly to solve existing technologies problems, such as low conversion rate and needing precious metal when use solo pure zeolite molecular sieve catalyst, and raw materials and components demanding. This invention takes carbon 9 and above aromatic hydrocarbon as raw material, in the fixed-bed reactor, use symbiotic molecular sieve that contains 10 ~ 80% (weight) of beta zeolite and Mordenite, and 20 ~ 90% (weight) inorganic binder composition of the catalyst that at least one selected from the gamma-Al2O3, thin diaspore, silica, silicon oxide, alumina oxide, bentonite, kaolin, diatomite or montmorillonite. Take reaction under the conditions of the reaction temperature 300 to 500 deg, pressure of 1.0 to 3.5MPa, raw materials weight space velocity of 1.5 ~ 6 .0 per hour, hydrogen and hydrocarbon molar ratio of 2.0 to 6.0 to obtain product containing benzene, toluene and xylene.