Abstract: Polystyrene-divinylbenzene(4%) beads were combined with anhydrous aluminium chloride and stannic chloride (1:1) in chloroform to form a stable complex containing 7.73% of chlorine, in which the ratio of metal aluminium to metal tin is 2/1. It correspond to (0.278 mmol SnCl₄+ 0.557mmol AlCl₃)/1g complex beads. The complex beads (PS-Al/Sn) can be used to catalyze a lot of organic reactions, such as esierifications, acetalizations, ketal formations, ethe-rification and the Friedel-Crafts alkylations. The greater reactivity of the PS-Al/Sn compared to PS-A1Cl₃(6) and PS-SnCl₄(7) was confirmed in these reactions. It is important that the dibasic metal complex PS-Al/Sn as a fine catalyst can be reused at least 10 times in high yields.