中文摘要：

文章基于百度迁徙数据构建人口流动的关系矩阵，完整刻画出2015年春运期间全国人口在东部与中西部城市间省际循环流动的空间集聚与扩散过程。主要研究结论：（1）2015年2月13日（腊月廿五）至17日（腊月廿九）和2月25日（正月初七）至3月1日（正月十一）是春节前返乡流和节后返工流两阶段人口净流入（流出）的峰值时段，两阶段各市目人口净流入人次存在正负对应的规律性特征；（2）人口省际流动的近域特征、空间依赖关系并存，京津冀、长三角、珠三角城市群主导了高强度人口流动，并形成3个扇形辐射区域；（3）识别出全国94个人口流入城市和242个流出城市。在空间上．人口集聚的沿海绵延带与人口流失的中部塌陷带共同构成流入、流出城市的双纵平行格局。

英文摘要：

Based on Baidu migration data ,this paper constructs the relationship matrix of population movement, and fully depids the spatial agglomeration and diffusion process of inter-provincial circulation of Chinese population in the eastern, central and western regions during the spring festival of 2015. The conclusions are as follows： （1） February 13th-17th and February 25th-March ist are respectively the back-home flow and the pastganglionic return flow peak periods; （2） The inter-provincial flow is characterized by both near field and spatial dependency. Beijing-Tianjin-Hebei,Yangtze River Delta, and Pearl River Delta city group led the high-intensity population flows,and form three fan-shaped radiation areas; （3） we identify 94 population inflow cities and 242 outflow cities. The population agglomeration along the coastal areas and the population collapse in middle areas form the double vertical pattern of the floating population in China.