A sub-structure model of aero-engine compressor′s bladed disks is established. Considering the non-linear contact problem of tenon and mortise, the frequency veering characteristic of the bladed disks from the perspectives of the strain energy is analyzed. Then, the modal vibration contribution degree factor and localization factor of the mistuned bladed disks are calculated, as well as the forced vibration response contribution degree factor and localization factor on the frequency veering distance of the mistuned bladed disks. The relationship of the frequency veering distance and contribution degree factor for the mistuned bladed disks localization is studied, and the results indicate that the frequency veering had a significant effect on the mistuned bladed disks localization, the degree of the localization is relatively high in the region of frequency veering. The contribution degree of bladed strain energy on the mistuned bladed disks changes along with the frequency veering distance.