Xiao-filiality is the most fundamental concept in the Chinese intellectual-cultural tradition. It represents not only family values but also religious, political and ethical ideologies. The conception of xiao, which originally denoted the meanings of presenting offerings to deceased ancestors and inheriting their legacy in the Shang dynasty, went through two stages of evolution from the early Zhou dynasty to the Warring States period. In the first stage, xiao was extended to ethical domain with the humanistic turn from human-spirit relationship to human-human relationship. Xiao was not only expanded to the empirical exercise of serving living parents but also established as a ritual-ethical norm that defined people’s familial, social, and hierarchical role duties and regulated their conducts of dealing with interpersonal relationships. As a result, the religious authority of paranormal ancestral spirits was transferred to the social-political authority who enforced the implement of the ritual-ethical norm of xiao. In the second stage, Confucius and his followers on the one hand recognized the importance of compliance with this prescribed ritual-ethical norm, and on the other internalized it to become the individual agent’s moral emotion and free choice. Consequently, the social-political authority was further transferred to the internal authority of moral autonomy.