Old-age care is a major social issue related to the realization of the goal of common prosperity and the well-being of hundreds of millions of people. The research on both the supply and demand ends of the traditional old-age service system was conducted and found that there were difficulties on the demand side, such as uneven supply and demand structure, imperfect system construction, substandard service quality, and insufficient spiritual satisfaction, and there are persistent problems on the supply side, such as fixed activity time, single activity form, formal activity development and irregular personnel management. On this basis, a new path for multiple subjects to embed in the elderly care service system with the help of the linkage effect of the "shared pension" platform is explored, and policy suggestions are put forward such as improving policies and systems, comprehensively strengthening resource coordination capabilities, multi-subject participation, efficient integration of social pension resources, promoting the trend of helping the elderly, and giving full play to cultural cohesion.