Propylene polymerization was conducted at 0degreesC in heptane or chlorobenzene (CB) by an ansa-fluorenylami-dodimethyltitanium complex combined with dried, modified methylaluminoxane that had been treated by dilution with heptane and successively repeatedly vacuum dried to remove any free trialkylaluminiums. The post-polymerizations testified that the living polymerization proceeded irrespective of the solvent used. The heptane system gave the syndiotactic poly(proplene)s (PPs). whereas the CB system gave almost atactic PPs. After the first polymerizations in heptane had been completed, the same amounts of propylene and CB were added for the second polymerization. This procedure gave the sydiotactic stereoblock PP with narrow molecular-weight distributions.