<p>Heterogeneous polymerization represents a widely employed method in the polyolefin industry. In recent years, various heterogenization strategies for late transition metal catalysts have been developed, enabling effective control of polymer morphology and optimization of catalytic performance. However, while most studies have focused on designing anchoring groups and advancing support approaches, systematic investigations into how the support influences the catalytic behavior of the late transition metal catalysts. In this work, we fabricated supported <i>α</i>-diimine nickel catalysts by functionalizing the ligand with alkyl alcohol chains of varying lengths and supporting them onto MgCl₂ supports. The ethylene polymerization behavior of these catalysts was then investigated. By precisely adjusting the alkyl alcohol chain length, the distance between the catalytically active metal center and the support surface was modulated. This approach demonstrates that support-induced steric hindrance effect can be effectively regulated by controlling the separation distance between the metal center and the support surface.</p>