Between 2011 and 2015，Chinese population will experience series of issues：the bottom of Chinese population pyramid will accelerate shrinking，and unbalanced population sex ratio among 19 years old and younger，as well as increased population flow from rural area to urban area will accompany the processing of the shrinking. Population flow accelerates the population aggregation. Population density in metropolitan and east costal area will continue increasing during “The Twelfth Five-Year Plan” period. And this population aggregation will speed up the “empty shell” phenomenon in the remote rural area.