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用ESR方法对MgCl2负载的钛系Ziegier-Natta催化剂进行了研究，获得了分辩率较好的谱图，并结合前人的工作将信号的归属同钛原子在MgCl2上的负载情况对应起来．同时考察了内外给电子化合物对ESR谱图的影响，探讨了它们可能的作用机理.
ESR method was used to study the MgCl2-loaded Ziegier-Natta catalyst. A good resolution spectrum was obtained. Corresponding to the previous work, the assignment of signal to the loading of titanium atom on MgCl2 was obtained. At the same time, the effects of internal and external electron-donating compounds on ESR spectra were investigated and their possible mechanism of action was also discussed.