Abstract: Based on Baidu migration data，this paper constructs the relationship matrix of population movement，and fully depicts 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 1st are respectively the back-home flow and the postganglionic return flow peak periods; ( 2) The inter-provincial flow is char- acterized 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．

Keywords:  Spring Festival Travel Rush, Population Flow, Inter-provincial Migration, Spatial- temporal Pattern

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，两阶段各市日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。

关键词: 春运, 人口流动, 省际流动, 时空格局