It was found that the C−H activation barrier can be divided into two parts: C−H approaching and bond breaking energies. The C−H approaching process starts from the reactant and ends at a cross-point structure which is followed by the C−H breaking process. This finding was proved by the intrinsic reaction coordinate (IRC) analysis, vibration frequency (VF) analysis, atom-centered density matrix propagation (ADMP) calculation, and potential energy surface (PES) scan. Further research revealed that the C−H bond breaking energy was related to the electronic structure of the catalyst and the C−H bond dissociation energy of the substrate, whereas the C−H approaching energy was highly relative with the interaction between the substrate and catalyst. These results may be helpful in designing a more effective catalyst.