Under the comprehensive rural revitalization, the government will purchase elderly care projects to support rural public services, deepen multi-agent cooperation, and build a rural elderly care consortium. According to different supply subjects, the current rural community home-based elderly care service projects are divided into three categories: community home-based elderly care projects led by "Internet plus" companies, home elderly care beds projects led by medical care institutions, and elderly social work projects oriented by community governance. Drawing on the theory of grid governance, this study compares the differences in service planning, experience, and effectiveness among different attribute providers, and explains the micro process of subject differentiation under project-based governance. There are three dilemmas in service supply: profit-making organizations are characterized by mechanical and low-quality services, mixed organizations deviate from their goals and negotiate services, and non-profit organizations are characterized by administrative adsorption and fragmented services. Ultimately, the three are moving towards "alienation" of services and "internalization" of personnel, due to the blurring of government boundaries and difficulties in autonomous coordination among the main bodies. It is recommended to introduce the concept of life cycle, build a collaborative mechanism based on family needs, reintegrate multi subject participation, clarify mutual obligations and innovate processes, and leverage government leadership at a new level to reshape multi subject cooperative relationships.