To address the high cost, imperfect function, poor content, and unfitted buying habits of overseas customers in developing international trade on-line stores, based on the open source software Magento, this study develops an international trade on-line store that is of low cost, full-featured, content-rich, and in line with buying habits of overseas customers, through the design (including the choice of virtual hosts, Magento versions and expansion modules) and the implementation (including the installation and configuration of the chosen version and modules and the webpage customizations). It can give helpful reference and guidance to the design and implementation of international trade on-line stores based on Magento.