On-center handling has drawn lots of attention from consumers and car manufactures for its extraordinarily large effect on vehicle security at high speed. So far, there are a large number of objective evaluation indices for on-center handling, but it is not clear which ones are the key points on evaluation indices. In this paper, the authors propose a simplified on-center handling objective evaluation index system. Firstly, a basic on-center handling objective evaluation index system is summarized based on the ones of ISO, GM, MIRA, TRC and Hyundai, and then dynamics analysis on each index is conducted so as to primarily eliminate the redundant indices. Secondly, the repetitive indices are cut out again by the correlation analysis among indices in objective tests for eight types of vehicles. Thirdly, the importance factor of each subjective evaluation index is gained on the basis of subjective evaluation tests for eight types of vehicles by the weighed principal component analysis. The weight factor of each subjective evaluation index is obtained from subjective evaluation engineers. And then the objective evaluation indices influencing each subjective index are summarized to establish the priority of importance for objective evaluation indices of which the importance factors are assigned from each related subjective index by objective index dispersion. At last, the importance of objective evaluation indices are verified by the survey on the applied objective evaluation index systems of GM, MIRA, TRC, Nissan and Toyota. A comprehensive, not repeated on-center handling objective evaluation index system has been established to guide the vehicle development.