The Amendment of the Legal Regime of Real Estate Leasing Provided in the Civil Code（Law No. 13/2017）came into effect on 18 February 2018. It is the first amendment brought to the legal regime of real estate leasing laid down in Macau Civil Code since Reunification in 1999. Throughout the stages of proposal，discussions and voting，this Law has never ceased to arouse controversies and attention among various sectors of the community. By briefly presenting the origin，evolution and implementation of the idea of binding regime（vinculismo）that permeates Portugal’s legal regime of real estate leasing，along with the analysis of its impact on Macau’s regime，this article confirms that real estate regulations characterized by binding regime have always existed in the legal system of Macau. The proponents of this Law intended to reinforce this idea. The nature of the controversies triggered by this Law is essentially related to the measuring of the value of fundamental rights. Regarding such fundamental rights which have been in constant conflicts，this article provides feasible suggestions of the criteria for measuring the value of relevant rights.