Chefoo is located in the eastern of Shandong peninsula, and offshore across from Korean peninsula. According to the Chinese traditional Maritime Customs Publications, this study aims to analyze the content of the sea route between Chefoo and Incheon. Moreover, it is expected to investigate the establishment and management of the sea route. Since the openness of Incheon in 1883, the economic communications between Chefoo and Incheon became more frequent. Although the steamers from China, Russia and Japan were in charge of shipping between China and Chosun, the major steamers were from Japan at that time. In addition, the junks from Chefoo played subsidiary role due to their weaker transport abilities, since the main forces between Chefoo and Incheon were steamers. The openness of the sea route and the growth of Shandong merchants made crucial contributions to the establishment of Shanghai-Chefoo-Incheon network which Chefoo played an important mediating role in the networks.