中文摘要：

评述了自二十世纪五十年代至今近五十多年聚丙烯催化剂的几个重要发展阶段，着重介绍两类（单活性中心与多活性中心）三种聚丙烯催化剂，即Ziegler-Natta催化剂、茂金属催化剂和后过渡铁金属催化剂催化丙烯聚合的机理。

英文摘要：

In this paper, we reviewed the development process for polypropylene catalysts, which is divided into several important periods. In addition, this comments concentrated on two types of catalysts （i. e. the single- and the multi-site catalysts） and three kinds of catalysts （i. e. Ziegler-Natta, metallocene and late-transition iron metal catalysts）. We also introduced the polymerization mechanism of the above catalysts.