Abstract: To investigate the effects of KCl substitution for NaCl in different proportions on lipid oxidation in pork processing, 3% or 4% of NaCl, which was partly replaced by 15%, 30%, 45%, or 60% of KCl, respectively, were added to the minced longissimus muscles, then kinetic law of lipid oxidation was studied after treatment at different temperature. The results showed that at a fixed salt content and composition, both the primary and the secondary lipid oxidation rate constants increased with the increasing temperature. At a fixed temperature, lipid primary oxidation rate constants decreased with the increasing of KCl substitution proportion at a 3% salt content, while which first increased and then decreased with the KCl substitution proportion when salt concentration was fixed at 4%, reaching a maximum at 45% of KCl proportion. The Arrhenius equation analysis showed that at 3% salt concentration, the activation energies of both lipid primary oxidation and lipid secondary oxidation increased linearly with the increasing of KCl substitution proportion (P<0.05), while when salt content was at 4%, partial replacement of NaCl with KCl had no significant effect on the activation energies of lipid oxidation (P>0.05). Therefore, partial replacement of NaCl with KCl could improve the lipid oxidation stability in pork linearly with the substitution proportion if total salt concentration is at about 3%, and no significant effect was observed if total salt content was at about 4%.