Abstract: Recent developments of chromium based polyethylene catalyst are described in both heterogeneous catalyst system and homogeneous catalyst system. The main progress and application of new active components and carriers are introduced. Synthesis and application of new homogeneous metal complex catalyst with different Cr active centers，including Cr(Ⅱ)、Cr(Ⅲ)、Cr(Ⅳ)，are discussed. The development prospects of chromium based catalysts for polyethylene is also proposed.

Key words: chromium based catalyst, polyethylene, heterogeneous catalytic system, homogeneous catalytic system

摘要： 从非均相催化体系和均相催化体系两个方面，详细介绍了铬系聚乙烯催化剂近年来的研发情况。指出了在非均相铬系聚乙烯催化体系中新型活性组分研究及新型载体应用的主要进展；分别讨论了以Cr(Ⅱ)、Cr(Ⅲ)、Cr(Ⅳ)为活性中心的新型均相铬金属配合物催化剂近年来的合成及应用情况；在此基础上，对铬系聚乙烯催化剂的研究前景进行了展望。

关键词: 铬系催化剂, 聚乙烯, 非均相催化体系, 均相催化体系