Abstract: In the paper，we systematically construct the measuring system of investment facilitation，and evaluate and compare the level of investment facilitation of 140 countries (regions) including 50 “One Belt and One Road” countries from 2010 to 2015 by using the method of factor analysis，which are based on the related data of GCR.The research shows that financial service has a greatest impact on the level of investment facilitation of “One Belt and One Road” countries，followed by infrastructure and macroeconomic situation，and system environment has the minimal effect on them.At the same time，the level of investment facilitation is too low of “One Belt and One Road” countries，which has a large gap with developed countries；there are obvious differences between nations and regions and outstanding non equilibrium of them in the level of investment facilitation，and overall there is a greater room for improvement.In the future，“One Belt and One Road” countries should reinforce policy communication，promote infrastructure interconnection，strengthen the coordination with fiscal policy and monetary policy，perfect financial service system and create a good system environment.

Key words: “One Belt and One Road”, investment facilitation, sgstem environment, financial service