The core of “the Belt and Road” plan lies in the interconnection，the easiest and most effective component of which is the traffic interconnection. The China-Russia-Mongolia economic corridor is the best carrier and important backbone for the strategic connections among the three great strategies，namely the “Chinese Silk Road”，the Russian “Cross-Eurasia Development Belt” and the Mongolian “Grassland Road”，and for the construction of infrastructural interconnection. This paper focuses on analyzing the implication and strategic value of the China-Russia-Mongolia Economic Corridor，the condition for laying out and boosting of the trilateral cooperation，its restraint factors and countermeasures. The author deems that during the promotion of the China-Russia-Mongolia Economic Corridor，it is necessary to eliminate any interference，strengthen strategic communications，expand dialogue channels，and enhance mutual political trust，establish a connection mechanism，so as to reap an early-stage harvest as soon as possible and to set up an example and lead a role for cooperation in other fields.