Since reform and opening-up, China has eliminated many regulations which limited the free migration of population, and the market economic impact on migration became increasingly strong, population migration becomes a common social phenomenon. In order to research temporal and spatial variations of Chinese population migration characteristics from sampling survey data in recent 10 years, we apply Moran's I & Geary's C to explore the spatial effects of migration's spatial distribution pattern. It turns out - the main immigration regions gradually expanded from the Pearl River Delta area to the Yangtze River Delta and Bohai Rim region in late decade, and showing a multi-polar pattern. Meanwhile, the population outmigration regions showed a spatial convergence trend from northwest and northeast to the central region. Then, we analyze the influence factors of population migration with grey associated entropy, and find that regional economic development level, urbanization level & region openness degree all have a positive stimulus on the immigration.