Abstract: Intergenerational programs play an important role in alleviating generational tensions, reshaping intergenerational relationships, and addressing the challenges of population aging. American public libraries' intergenerational programs started early and have accumulated rich practical experience. Drawing on these practices, the study adopts a strength-based perspective to provide a reference for China's public libraries in serving both the elderly and children. The study categorizes U.S. intergenerational programs into two types: kinship-based and non-kinship-based. It systematically reviews their practices according to service orientation, and uses comparative research and case study methods to analyze representative intergenerational programs in American public libraries. According to the service orientation, these  programs can be divided into three types: intergenerational reading services that focus on reading development, intergenerational interactive services that focus on relationship building, and intergenerational mutual assistance services that focus on skill improvement. Looking ahead, public libraries should pay attention to developing resources for both the elderly and children to create an internal service cycle, strengthen identity recognition to enhance effective interaction between individuals and society, and adopt a collaborative perspective to empower these two groups.