中文摘要：

中蒙、中俄双边贸易具有互补性。根据显示性竞争优势指数（CA）,中国、蒙古国、俄罗斯三国分别在SITC8（杂项制品）、SITC2（非食用原料）、SITC3（矿物燃料、润滑油及原料）类产品上具有竞争优势;根据产品分散度指数（EN）,中国出口产品多样化程度总体上高于蒙古国和俄罗斯,但近年来有所回落;根据经常市场份额模型（GMS）,在中蒙、中俄双边贸易中,中国出口增长分别依赖于市场扩大效应、竞争力提升效应,而蒙古国、俄罗斯分别依赖于竞争力提升效应、市场扩大效应。

英文摘要：

The bilateral trade in Sino-Mongolia and Sino-Russia are complementary.According to Competitive Advantage Index,China,Mongolia and Russia have competitive advantage in the products of SITC8（Miscellaneous manufactured articles）,SITC2（Crude materials,inedible,except fuels）,SITC3（Mineral fuels,lubricants and related materials）seperately;on the basis of Equivalent Number Index,the diversification of export Product in China is higher than Mongolia and Russia,but in recent years it has come down;according to Constant Market Share Model,in Mongolia,Russia bilateral trade,China＇s export growth seperately depended upon the market expansion effect and Promotion effect of competitiveness,while Mongolia and Russia,respectively,depended upon the Promotion effect of competitiveness and the market expansion effect.