［目的/意义］ 公共文化服务体系建设进入“提质增效”阶段，引入多元供给模式，提升公共文化服务活力、质量和参与度，成为基层公共文化建设的重点和难题。［方法/过程］ 以杭州某新社区为案例，结合活动档案资料、问卷调查和多元回归分析，探究社区居民公共文化参与行为（包括参与频次、深度和再参与意愿）及其影响因素。［结果/结论］ 研究发现，发达地区基层社区注重公共文化服务多元供给；居民服务需求较高，但持续参与和主体意识仍较弱。政府主导模式存在高频低质风险；社会力量供给模式存在质量优势和制度化参与困境；兴趣匹配和文化圈层效应在社区公共文化服务中发挥重要张力。研究建议，深化政府主导，社会组织、企业、公民志愿团体多元协同供给。政府主导模式可提高服务质量和普惠度，社会供给模式可提高服务专业性、精准性和制度化参与。增强质效评估指标和数智赋能，满足不同收入阶层、性别和年龄群体需求。

[Purpose/Significance] The construction of the public cultural service system has entered a stage of quality improvement and efficiency enhancement. Introducing a diversified supply model to enhance the vitality, quality, and participation in public cultural services has become a key focus and challenge in grassroots public cultural construction. [Method/Process] This study took a young community in Hangzhou as a case, combining activity archive data, questionnaire surveys, and multiple regression analysis to explore community residents' public cultural participation behaviors, including participation frequency, depth, and willingness to re-participate, as well as their influencing factors. [Result/Conclusion] The study finds that grassroots communities in developed regions emphasize diversified provision of public cultural services, and residents have high service demand, but sustained participation and a sense of ownership remain weak. The government-led model carries the risk of high frequency but relatively low quality. The social forces provision model has quality advantages but faces difficulties in institutionalized participation. Interest matching and cultural circle effects play an important role in community public cultural services. The study recommends that under a government-led model, participation by social organizations and enterprises, as well as multi-stakeholder collaboration by citizen volunteer groups, should be deepened to improve service quality, professionalism, precision, and institutionalized participation to meet the needs of new urban communities across different income levels, genders, and age groups.