This study examines the ROK's export policy of defense products, and provides policy suggestion for expanding defense industry export. Leading countries in defense industry export, including the USA, the United Kingdom, France and Russia, have actively driven export policy led by her governments' authority. In order to expand defense industry export, it is essentially required for the ROK to develop advanced defense technologies and produce competitive defense products, both in price and quality. For this, the integrated effort of the government, industry, military and R&D organizations is crucial. In addition, the ROK should actively cultivate international markets for expanding defense export supported by the government. The ROK is also needed a close cooperation with the US for expanding its defense industry export. The ROK government should provide various institutionally supporting incentives for expanding defense export to the defense industry circles. Those are included foreign countries's defense acquisition plans and long-term demands, tax reduction, finance support, and hosting international exhibition events on defense products.