Novel methodology was developed for preparation of isospecific metallocene catalysts for olefin polymerization that are tethered on silica surfaces with covalent bonds. A racemic -zirconocene complex that has a Si-Cl moiety on its bridge was immobilized on SiO 2 by the reaction of the Si-Cl anchor with Si-OH on the solid surface. The prepared solid catalyst was found to be effective for isospecific propene polymerization (catalyst ). Pretreatment of silica surfaces with Me 3 SiCl improved the catalyst performance (catalyst ). An -zirconocene complex with a BH group reacted with "vinyl-coated" silica gel to afford another immobilized catalysts (catalyst ). This catalyst achieved satisfactorily high catalytic activity and high isotacticity in its produced polypropene.