The Strength Of Economic Ties Between Major Cities In Pan-Yangtze Delta

Yangtze Delta occupies an important position in China's economic development. Along with the area accelerating the pace of economic integration, its impact on surrounding provinces became stronger.and soon the concept of Pan-Yangtze Delta came into being.This paper aims to study the strength of economic ties between major cities in the pan-Triangle delta and analyzes the economic magnetism that the core cities plays on its surroundings. Amending the Spaces interaction model is the special research methods, introduction of regional specialization index to the original model can reflect the differences between industries. The revised model is used to account the intensity of the economic ties between Shanghai and cities of other four provinces, the capital cities and other cities,Nanjing,Hangzhou and the cities of Anhui provinces .The calculation results is what the corresponding policy implications based.