Public libraries are important force to bridge the digital divide in the digital transformation of society. Based on literature and case studies, this study analyzes the background of promoting digital equity in American public libraries. Focused on two reports, 2020 American Public Library Technology Survey and Leverage Libraries to Achieve Digital Equity for All, and combined with literature and case studies, this study summarizes the key measures, characteristics and implications. The key measures include: the supply of technical resources inside and outside the library, the construction of network infrastructure, the provision of technical support services or resources for users online, and digital literacy and skills training. Public libraries in China can optimize from following aspects: enhancing the accessibility of network and digital technology facilities, enriching the types and service forms of online digital resources, emphasizing digital literacy education and computer skills training, enhancing rural digital service capabilities through specialized projects, and seeking external diversified cooperation to establish special funds.