Consensus on the Basic Law is an important social foundation for the effective implementation of the Basic Law, and an important guarantee for "one country, two systems" and the long-term prosperity and stability of Hong Kong. Consolidating consensus on the Basic Law as the "high-level goal" of the implementation of the Basic Law is becoming more and more prominent, and promotes the "return of people’s hearts" in Hong Kong society. The research on the consensus of the Basic Law should be brought into the field of study of the Basic Law. This paper attempts to combine the research methods of constitutional sociology with the constitutional order of "one country, two systems" in Hong Kong, and propose a theoretical framework for condensing the social consensus of the Basic Law in Hong Kong , trying to expand the theoretical horizons of Hong Kong Basic Law research and the research path of Chinese constitutional sociology. This paper focuses on the social construction perspective of the consensus of the Basic Law, and explores the process of meaning construction, action strategies, and mechanism protection of the Hong Kong Basic Law at the social level. Meaning construction includes value construction, norm construction, and expression construction. Action strategies include education, media, and organizations. Mobilization and other means, the mechanism guarantee includes organizational coordination, deterrence, incentive, supervision and other mechanisms. At the same time, there is a close interaction between the meaning construction, action strategy, and mechanism guarantee of the Basic Law consensus, and realize the basic law text to the basic law consensus.