Famous international scholar Duan YiFu said, “geographical view is the mirror of man". Kaohsiung harbor can develop as an industrial scene and commercial harbor metropolis into in the urban network of the world, because of the dialogue and interaction amongst people and places for a long time. It also resulted from a great deal of natural conditions, human factor and interacted mechanisms with government policies. There have been lots of research on the development of Kaohsiung harbor-city, especially about the issue of “unity of harbor and city". However, the meaning and importance of Kaohsiung harbor to Kaohsiung city is unable to realize in the context of one harbor or one city. This study is to explore the interaction of harbor-city development by geography data mapping, and to present spatial information (railway development, urban plan, population, industry, land utilization etc.). Similar to most research, we can see interactions between harbor and city resulted in growing prosperity of industrial harbor. The interdependency between a harbor city and its historical context is undoubted (Wu, 2004: 89)。Secondly, under the circumstances of the postindustrial city development, this study argued that the interdependent relationship with a harbor and a city has been incrementally dispersed since the symbiosis in the past. In order to increase the close independency between Kahsiung city and the harbor, there are many policies needed to plan and implement. Finally, under the trend of the harbor city unify in Kaohsiung, the study found that interaction between Kaohsiung harbor and the city is related to the conflict of land use, the problem of overlapped administration and the dispersed impact of harbor development to regional economics.