An isospecific heterogeneous zirconocene catalyst was prepared by supporting rac-Cl(2)SiInd(2)ZrCl(2) on MgCl2 using an impregnation method. Polymerization of propene was conducted over this combined with methylalumoxane as co-catalyst. It was found that the catalyst displayed a fairly high activity to give highly isotactic polypropene at 40 degrees C. With an increase in the polymerization temperature from 40 to 100 degrees C, the activity increased monotonically accompanied by a decrease in isospecificity.