In the developing process of the international human rights system, the outstanding Chinese representative Pengchun Chang participated in the drafting of the Universal Declaration of Human Rights and made prominent contributions. This paper attempts to use triangulations to analyze and discuss the significant role played by Pengchun Chang in constructing the international human rights system by employing literature studies, empirical studies and a case study. It is believed that it was not accidental for Pengchun Chang to become a principal architect of the international human rights system, and his cleverness and wisdom benefitted from both the excellent traditional Chinese culture and the Western philosophies and essentials of the Western education.