Since the reform and opening up, the scale of China's floating population has been increasing, and the proportion of inter-provincial migrants has been also increasing. Although there are many studies on Inter-provincial Migration of floating population, few focus on inter-provincial migration distance. Based on the 2000 and 2010 census data, this paper examines the migration distance per capita and differentials by province. The results show that the migration distance per capita in China kept increasing from 980.51 km in 2000 to 994.82 km in 2010. The provinces with higher migration distances are mainly located in the west, while the provinces with lower migration distances are mainly located in the east. There are gender differences in migration distances per capita, and females are more inclined to close migration. In 2010, the average migration distance of males was 1000.75 km, while that of females was 987.01 km. The gender differences in migration distances are shrinking. At the same time, the paper also discusses the influencing factors of Inter-provincial Migration of migrants from three aspects: economic factors, age structure and migration scale.

 The “Hu Line”and its demographic implications have attracted world-wide attention since the line was developed 80 years ago．Using GIS，this paper conducts a statistical analysis and systematic investigation on the stability and spatial patterns of China’s minority population growth on both sides of“Hu Line”by constructing the spatial database of China’s census data from 1953 to 2010 and initiating a new method for identifying the spatial patterns of population growth．Major findings are as follows: ( 1) Spatial distribution of the minority population in China is not balanced，showing a signifi- cant spatial clustering; ( 2) The minority population is widely distributed across China，spreading to East China and all over the country; ( 3) The distribution pattern of China’s minority population is characterized by extraordinary stability，with the share ratio of south-east half to north-west half standing roughly at 75: 25 from 1953 to 2010．We can thus say that the“Hu Line”is also a mutant line of China’s minority population．