Zhang Hengshan's academic career began with the "standard dispute" which can be recorded in the history of China law. During the period of 1988, some scholars put forward the view of "right-based" at the law seminar in Changchun City, Jilin Province. Zhang Hengshan, then a young scholar, boldly expressed reservations. As a discussion, he published what is the focus of law? On politics and law,No. 1989. -Comment on the article "The Right Standard" and put forward the proposition that "the focus of law lies in obligation". Therefore, "the theory of duty center of gravity" has become a bright spot to guide him to explore in the vast night sea of jurisprudence. In the name of Beiyue, he has published such high-level papers as Definition of Legal Rights, Rational Basis of Legal Obligations, Significance of Rationality in Law, Consistency of Human Rationality and the Source of Legal Rules, and Moral Basis of Human Rights in the journals of Legal Research and Modern Law. Even the "works on in-depth study of legal rights and responsibilities in recent years" cited by a scholar in Hong Kong were written by Bei Yue. Zhang Hengshan's insistence on obligation stems from his different understanding of obligation with his colleagues in domestic academic circles. When domestic scholars almost agree that obligation is a burden and a disadvantage, and only negative value or value is attached to rights, Zhang Hengshan thinks that obligation has its own moral basis and independent positive value with "should" as the core; In the original sense, obligations are not attached to rights, on the contrary, rights are generated by fulfilling obligations. The difficulty and high cost of market economy operation and interpersonal communication caused by the general lack of honesty and non-compliance with obligations in contemporary China prove Zhang Hengshan's vision of adhering to the theme of obligations and its great value in legal culture and social culture.