This chapter synthesizes findings on using densification as a design tool for sustainable urban regeneration in China. It confirms that densification, characterized by increased residential units, public facilities, and mixed use forms, can enhance sustainability and quality of life when applied moderately and context-specifically. Critically, social sustainability and resident participation are foundational to successful implementation. It concludes by proposing actionable guidelines for planners, emphasizing interdisciplinary urban design and continuous community engagement to achieve socially sustainable,high-quality regeneration.