Japanese industries are changing their manufacturing plants from Japan to overseas. Corresponding to the base shifting, optimum arrangement of their distribution centers in Japan must be changed. However, the shifting examples of distribution centers seem to be few. They are still remaining at the inland positions. We had a opportunity to hear a view on the distribution systems. Gathering some informations of transportation system, we investigate the distribution system and find out a great deal of merits, that is, cheap distribution fee and small transportation ton・km when the distribution centers are shifted from the existing inland places to a wharf zone.