Abstract: In the context of rising prevalence of living alone among young adults, this study uses one-per-thousand sample data from the 2000, 2010, and 2020 population censuses to examine trends and determinants of living alone among young adults aged from 20 to 49 in China over the past two decades. Decomposition methods are employed to assess the contributions of marriage behavior, population mobility, and solo living feasibility to the period trends and disparities by gender and place of residence. Results indicate that improved solo living feasibility and population mobility were the dominant drivers of the rising prevalence of living alone among young adults. Gender differences in solo living feasibility and marriage behaviors explain higher prevalence of living alone among men than among women, while enhanced mobility primarily accounts for higher prevalence of living alone in urban areas than in rural areas. Across the life course, mobility and delayed marriage drive rising prevalence of living alone during early adulthood, whereas solo living feasibility dominates in middle adulthood. Family-related social policies must address future trends and the heterogeneous trajectories of living alone.

Keywords: Young Adults, Solo Living, Marriage Behavior, Internal Migration, Decomposition Method

摘要： 在中国青壮年独居水平呈现大幅提升趋势的背景下，使用2000年、2010年和2020年全国人口普查1‰抽样数据，并利用因素分解法对20~49岁青壮年人口独居水平的变迁趋势、性别和城乡差异及其影响因素进行分析。研究发现，独居可行条件优化和人口流动增强是2000~2020年青壮年独居快速兴起的主导因素;独居可行条件和婚姻行为的性别差异是导致青壮年男性独居水平高于女性的主要因素，而人口流动则是导致城镇青壮年独居水平高于乡村的主要因素;从个体生命历程看，人口流动增强和婚姻推迟主导了青年向成年过渡阶段独居水平的上升，而独居可行条件优化成为壮年期独居水平上升的主导因素。鉴于此，家庭领域社会政策的制定要充分把握青壮年独居的未来趋势和异质性特征。

关键词: 青壮年, 独居, 婚姻行为, 人口流动, 因素分解