With the progress of BRI，China and countries en route cooperate in an active manner within the frameworks of BRI，co-designing the plans for common development. While incorporating existing projects into the BRI，China and relevant countries have come up with six blocs for economic cooperation. China-Mongolia-Russia Economic Corridor，New Eurasian Landbridge Economic Corridor，China-Central Asia-West Asia Economic Corridor，China-Indochina Economic Corridor，China-Pakistan Economic Corridor，and BCIM Economic Corridor. Being the backbones of BRI in relevant regions，the above-mentioned economic corridors and cross-border transport arteries constitute the blood streams of BRI and the incarnation of BRI. That accounts for the importance of cross-border passages in the BRI as a whole. This report gives an overall review of the security situation of cross-border passages，the factors relating to the security of cross-border passages before making proposals as regards the keeping of security of cross-border passages.