By the end of 2023, the elderly population aged 60 and above in China will reach 297 million, accounting for 21.1% of the total population, officially entering a moderately aging society. China has the overlapping characteristics of “aging before wealth, empty nest with fewer children, and urban-rural binary differentiation”. The traditional elderly care model separates medical and care resources and cannot meet the integrated elderly care needs of the elderly. The integration of medical care and elderly care is a localized solution for China to cope with population aging. Currently, four standardized formats have been developed, becoming the core carrier of elderly service supply. However, this industry has long relied on policy-driven development and lacks high-level specialized legislation. There are systemic legal risks to multiple core rights and interests of the elderly. Firstly, there is a lack of unified specialized legislation, and the existing norms are not well connected, with multiple links lacking unified legal standards; Secondly, there is a lack of clear regulatory responsibilities among multiple departments, resulting in duplicate supervision and a regulatory vacuum, and a lack of a comprehensive protection and supervision mechanism for elderly health information throughout the entire process; Thirdly, the rules for dividing liability for mixed infringement are unclear, the dispute resolution process is complex, and the cost of safeguarding rights is high; Fourthly, the liability insurance of elderly care institutions is only an encouraging regulation and lacks a mandatory risk protection mechanism, making it difficult for victimized elderly people to receive full compensation. In response to the above issues, based on the national guarantee obligation established by the Constitution and the theory of healthy aging, in order to achieve the long-term rule of law construction of Chinese style healthy aging, a closed-loop guarantee mechanism can be constructed from the four dimensions of “legislation regulation risk protection judicial relief”, and specific plans such as enacting special laws, establishing compulsory liability insurance, building joint supervision platforms, and improving rights protection channels can be formulated to form a rule of law pattern with complete systems, clear rights and responsibilities, and effective remedies, effectively protecting the rights and interests of elderly people in medical care and elderly care from infringement. This article comprehensively uses three research methods: firstly, normative analysis method, which systematically sorts out the relevant norms related to the integration of medical care and elderly care in the current constitution, laws, administrative regulations, and departmental rules, identifies obstacles to normative connection and the lack of statutory standards; Secondly, comparative research method is used to examine the legislative experience of foreign countries such as Japan's mediation insurance law system, Germany's long-term care insurance legislation, and the UK's comprehensive medical care legal framework, providing comparative legal references for specialized legislation in China; Thirdly, empirical research and case analysis methods will be used to collect and analyze typical judicial cases in the field of medical and elderly care integration in recent years, summarize the judicial differences and legal application difficulties in determining mixed tort liability, and evaluate the effectiveness and limitations of current policy driven approaches based on operational data from local medical and elderly care integration pilot projects. Based on the constitutional obligation of state protection and the theory of healthy aging, this article first defines the integration of medical care and elderly care as a fundamental elderly care service system with the core of safeguarding the health rights of the elderly from a legal perspective, and reconstructs the legal classification framework of four types of business formats. On this basis, a closed-loop guarantee mechanism is constructed from four dimensions: the legislative dimension promotes the promulgation of the “Medical Elderly Care Integration Service Law” as a high-level specialized legislation, the regulatory dimension builds a unified joint supervision platform and establishes a full process protection mechanism for health information, the risk bottom dimension establishes a mandatory liability insurance system for institutions, and the judicial relief dimension unifies the judgment rules for difficult scenarios such as mixed infringement through guiding cases and special judgment minutes. Through the above-mentioned four-dimensional collaboration, a rule of law pattern with complete systems, clear rights and responsibilities, and effective remedies will be formed, providing systematic protection for the rights and interests of elderly people in the combination of medical care and elderly care.