The work aims to explore the design points for realizing the composite sharing of community public facilities for the young and the aged under the background of population aging. Through the analysis and research on the physical and mental needs and behavior characteristics of the aged and young groups, it was pointed out that the design of community public facilities shared by the aged and the young should be people-oriented, and should accurately grasp the internal relevance of the physical and mental states and behavioral activities of the aged and the young in their daily life. The design should not only properly handle the health and safety, social entertainment, and emotional belonging needs of the aged and the young, but also consider the time domain, region, and type association of the aged and the young. Through theoretical research and demonstration, how to promote the communication and integration between the aged and the young through the design of community public facilities was explained. The design elements of public facilities based on the composite sharing of the aged and the young were proposed.The design of community public facilities based on the composite sharing of the aged and the young needs to pay attention to the integration, mutual assistance, mutual dependence and mutual entertainment of the aged and the young and should be explored in coordinating multiple needs, guiding mutual assistance and collaboration, promoting communication and companionship, and stimulating multi-dimensional interaction, so as to promote intergenerational integration and the realization of the all-age community environment.