The mechanism of C-H bond activation of ethane was catalyzed by palladium halide cations (PdX⁺ (X = F, Cl, Br, H, and CH₃)), which was investigated using density functional theory (DFT) at B3LYP level. The reaction mechanism was taken into account in triplet and singlet spin state potential energy surfaces. For PdF⁺, PdCl⁺, and PdBr⁺, the high spin states were the ground states, whereas the ground states were the low spin states in PdH⁺ and PdCH₃⁺. The reaction of PdF⁺, PdCl⁺, and PdBr⁺ with ethane occurred via a typical "two-state reactivity" mechanism. In contrast, for PdH⁺ and PdCH₃⁺, the overall reaction performed on the ground state PESs in a spin-conserving manner. The crossing points between two potential energy surfaces were observed and effectively decreased the activation barrier in PdX⁺/C₂H₆ (X = F, Cl, and Br). The minimum energy crossing points (MECP) were obtained used the algorithm in Harvey method. The natural valence electron configuration calculations were analyzed by natural bond orbital. The distribution and contribution of the front molecular orbital of the initial complexes could be further understand by the density of states. The feature of the bonding evolution in the main pathways was studied using topological analysis including localized orbital locator and atoms in molecules.