文章采用新新贸易理论的出口边际分析框架,将西部民族地区边境出口贸易的增长分解为集约边际和扩展边际,发现该地区边境出口贸易的增长主要通过集约边际来实现,扩展边际的作用十分有限。通过计算1996年至2010年该地区总体及各省区边境出口贸易对经济增长的弹性,认为这种数量扩张型的边境出口贸易较为有效地促进了西部民族地区的经济增长。最后从集约边际和扩展边际两个维度提出了拓展西部民族地区边际出口贸易空间的具体对策。 The paper uses the new marginal analysis framework of export of new-trade theory to decompose the growth of frontier export trade in western ethnic areas into the intensive and expanding margins. It finds that the growth of border export trade in the region is mainly realized through intensive marginalization, and the effect of expanding marginalization is very limited . By calculating the elasticity of the border export trade to the overall growth of the region and the provinces and autonomous regions from 1996 to 2010, it is believed that the quantitative expansion of the border export trade is more effective in promoting the economic growth in the western minority areas. Finally, from the two dimensions of intensive margin and extended margin, this paper puts forward the specific measures to expand the marginal export trade space in the western ethnic minority areas.