Using National Floating Population Dynamic Monitoring Data, statistical yearbooks and bulletins, the migration features of rural migrant workers' core family in cities with different sizes and the effect of city size on rural migrant workers' core family reunion are revealed through variance analysis, chi-square test and hierarchical logistic regression. Results show that there are significant differences in migration features of rural migrant workers' core family among cities with different sizes, and the family reunion status in large cities is the best; City size has stable and significant effect on rural migrant workers' core family migration decision-making, and it is most possible for rural migrant workers in large cities to realize family reunion in cities while least possible in super-big cities and mega cities; The effect of other city features, family features and individual features of fore-goer on rural migrant workers' core family reunion are different in cities with different sizes. Thereby, to cope with possible changes of population movement, the allocation of resource need to be better optimized among different city size.%利用全国流动人口动态监测数据和统计年鉴及公报数据, 根据新的城市规模划分标准, 使用方差分析、卡方检验和多层次非线性回归, 分析了不同规模等级城市中农民工核心家庭迁移的特征及城市规模等级对农民工核心家庭团聚状况的影响.结果显示:不同规模等级城市中的农民工核心家庭迁移特征存在显著差异, 且大城市中的农民工核心家庭团聚状况最好;城市规模等级对农民工核心家庭迁移决策有稳定的显著影响, 大城市中的农民工核心家庭最可能实现团聚, 特大及以上城市中的农民工核心家庭最难实现团聚;其他城市特征、家庭特征及先行者个体特征对农民工核心家庭团聚的影响作用在不同规模等级城市中均存在差异.因此, 应在不同规模等级城市间优化资源配置, 以应对可能的人口流动变化.
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