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I examined the route and vessels between Song China and Koryo in this paper. Up to now there have been researches which valued much of advent of a wedged bottom ship hereby it is said that in the East China Sea, the route of wedged bottom ship was used for a sail. However in this time flat bottom ships as well as wedged bottom ships took an active part. Therefore not only the tilted route of the East China Sea but also the existing crossing route of the Yellow Sea was used for a sail. In Song Dynasty, costal trade between Southern China and Northern China as well as foreign trade was developed Chinese marine trader who came to Koryo used medium size ships(wedged bottom ship) and small size of costal ships(flat bottom ship). It took much time for a flat bottom ships to cross the East China Sea because of it’s flat bottom. Therefore there was much possibility of wreck, so small size of flat bottom ships came from Southern China to Northern China later they came to Koryo crossing the Yellow Sea. On the other hand medium size of wedged bottom ships came to Koryo easily because of it’s structure along the tilted route of the East China Sea. In case of Koryo, there weren’t proper timbers for wedged bottom ship more than medium size in its own country. Consequently Koryo had only small flat bottom ships. In the Song China historical documents, we can verify the activity of Koryo sea traders. And ships of Koryo traders made a voyage across the Yellow Sea.