To generate improved catalytic capacity, especially, selectivity in disproportionation reaction and/or transalkylation reaction of an alkyl aromatic hydrocarbon.

In a method for disproportionating and/or transalkylating a hydrocarbon in a reaction zone having at least two catalyst beds containing different catalysts, one catalyst contains mordenite structure type zeolite being at least partially, pref., substantially entirely in an acid form and other catalyst contains mazzite structure type zeolite, pref., omega zeolite being at least partially, pref., substantially entirely in an acid form and the respective catalysts contain at least one element selected from metals of groups IB, VIII according to circumstances.