A new chiral ansa-metallocene catalyst, namely rac-dimethylsilyl-bis(2,4,6-trimethyl-1-indenyl)zirconium dichloride (1), has been synthesized and used as a catalyst for isospecific polymerization of propylene, with methyl aluminoxane (MAO) as the cocatalyst. The influences of polymerization temperature (T p ) on the polymerization activity, polypropylene (PP) microstructure and polymer properties are investigated, and the results are compared with rac-dimethylsilyl-bis(indenyl)zirconium dichloride congener (2) under identical conditions. 1/MAO has a very high activity for propylene polymerization at 50–70°C and 1atm propylene pressure. A beneficial feature of catalyst 1 is its higher stability at elevated temperature than 2. At T p =50°C, the novel catalyst shows a great improvement in terms of stereoregularity, with [mmmm]=92% and T m =146°C, while 2 displays [mmmm] of 82% and T m of 134°C under the same conditions. The regiospecificity of 1/MAO is also better than 2/MAO.