Abstract: The“Belt and Road”initiative is another major policy after China’s opening-up strategy in 1980s. This paper first finds，through principal component analysis，that the northern and western European countries have a higher score in trade facilitation among other countries along the“Belt and Road”. The paper then uses the panel data of China’s manufacturing exports to 48“Belt and Road” trading countries during 2012-2016 to make an empirical analysis from the dual marginal dimension of exports. The results show that trade facilitation has a significant impact on the intensive and extensive margins of manufacturing export，the greatest impact among other variables，and that the impact on the intensiveness is slightly higher than the extensiveness. In the subdivision of trade facilitation，e-commerce and financial environment have the highest impact on both margins，more prominent on the extensiveness，the average elastic coefficient being 0.893，that is，0.893 percent of dual marginal optimization for a one percent increase in the level of trade facilitation. Infrastructure and institutional environment also have important influence on the two margins.

Key words: “Belt and Road ”, trade facilitation, manufacturing, dual margin