Recently e-marketplace, one of the e-business models, has gotten the spotlight so many companies have invested in the E-marketplace work or considered doing business in such a fashion. According to these conditions, Internet business chances are expanded and strategic activities are increased in ocean or harbor fields, as well. In addition, these days, port-related-ideas have changed just increasing the carloadings, expanding the harbor facilities so called quantity growth into creating the high valued-added business, namely quality growth. The Shipping Instrument supply business is one of the important high valued-added businesses of the harbor-related field. However, because the Shipping Instrument supply business at Gwangyang Port is very poor and operated on a small scale, the harbor service business has not been activated. Thus this study demonstrates that the e-Marketplace is forming a way to expand the Shipping Instrument supply business in order to develop the harbor service business at Gwangyang Port.