Under the development trade of world economic integration, the relationship between port and it's hinterland economy is increasing close. The port is promoting not only the port itself but also the surrounding area's economic development. Simultaneously, economic development of hinterland supports a strong driving force for development. In recent years, China's coastal port has made tremendous achievements, and it is playing an increasingly important role in the opening to the outside world and China's economic development. Ports' level of development has been one of an important symbol to measure a country or regional level of economic development.This paper describes the interaction and impact between port and regional economy. And then from the positive and negative aspects to introduce the influence of port the regional economic development, and the traffic network of the Dalian port, and then introduce the influence of the regional economic development to the port, and also compare with other ports in the hinterland to show the strengths of Dalian port, and finally introduce the duty- free zone of the port to improve there are chances to the Dalian port. Through the analysis of Dalian port and its hinterland of three Northeastern Province, to improve Dalian port plays a very important role in the three provinces of northeast of China. Under the development of Dalian port's hinterland, Dalian port will become the more better international logistics for its hinterland.key words: Dalian port, hinterland, international logistics base.