Effect of chlorocyclohexane (CHC) on ethylene polymerization using MgCl2/TiCl4/TEA Ziegler-Natta catalyst system was studied, where MgCl2, TiCl4, and TEA (triethyl aluminum) were used as support, catalyst, and activator, respectively. The polymerization rate, catalyst activity, and produced polymer were significantly affected by the presence of CHC as a promoter. This study strongly indicates that CHC will act as a promoter with high performance in the ethylene polymerization. There was a remarkable increase in the catalyst yield and polymerization rate, particularly, in the presence of hydrogen which was used for controlling the molecular weight. A reduction in the polymer molecular weight was observed in the presence of CHC and hydrogen. The amount of the produced wax as a byproduct noticeably reduced. The morphology of the polymers was evaluated through scanning electron microscopy and particle size distribution.