本文以人口净流入为标准确定长三角城市群的范围，认定这个范围由苏浙沪的15个市组成，这个范围不同于通常的狭义、广义与泛义的概念。长三角城市群的现状可用规模以上工业销售收入、恩格尔系数、货运距离进而单位距离增加值等维度加以说明，而且根据这些维度能对长三角城市群的发展趋势做出推测：目前的长三角城市群具有向心与离心两种作用，前者会扩张既有范围而后者将缩减现有范围。
This report determines the range of the Megalopolis in the Yangtze River Delta which is consisted of 15 cities according to its net inflow of population. Through analyzing their sale incomes of industrial enterprises above scale，Engelian coefficients，average freight distance as well as its added value，the status and trend of the Megalopolis can be revealed and inferred.
| Keywords： | The Yangtze River Delta City GroupNet Inflow of PopulationAverage Freight DistanceValue Added of Unit Freight DistanceEngel Coefficient |
