Shaohui Gao，master of College of Economics & Management at South China Agricultural University，has been engaged in regional economics. This paper is the result of phase for the Young Scientists Fund of National Natural Science Foundation（41301106），Youth Project of National Social Sciences Foundation（12CJY050），Ph.D Program of Guangdong Natural Science Foundation（S2012040007386）and Project of Humanities and Social Sciences in Universities in Guangdong（2012WYXM_0011）.