This paper explores the development of Keelung from a fishing port to a major seaport city in Taiwan. It examines not only the history before the period of Japanese colonial rule, but also looks into Keelung's adminiatration and redevelopment by the Japanese Empire. In the 17th century, Keelung was tardy in developing under the Qing dynasty rule, though many imperialists were interested in her large coal mines and profitable location. After 1895, the Japanese Empire began a series of land inspections, port constructions, and widespread development of transportation. Keelung became the main port in communicating with Taiwan and Japan at that time. With cooperation between the government officials in Taiwan and in the Japanese capital, they made efforts in improving fishery, mining, and industry in Keelung. Keelung had transformed into a national trading port from a traditional fishing port. Moreover, the Japanese Empire projected a town renewal plan and put it into practice in order to match up the projects of port constructions. By the end of 1924, Keelung was promoted to city status, subordinated to Taipei country, establishing her position as a modernizing and urbanizing city from a fishing village.