China-Mongolia-Russia Economic Corridor is a key strategic area that China, Mongolia, and Russia are all dedicated to developing. However, China-Mongolia-Russia Economic Corridor cover three countries, and passes through multiple geographical units, and there are huge differences in economic, social, and ecological development within the regions. The construction of China-Mongolia-Russia Economic Corridor has many potential risks. Therefore, this paper studied the current socio-economic and environmental situation of main regions along the China-Mongolia-Russia Economic Corridor, including Primorski Krai, Khabarovsk Krai, Amur oblast of Fareast Region, Irkutsk oblast, Zabaykalsky Krai and Republic of Buryatia of Baikal region and Novosibirsk region, Mongolia, and Liaoning, Jilin and Heilongjiang of Northeast China. Then we revealed the main ecological environment risks, and put forward green development mode to achieve sustainable socio-ecological-economic development of the cor...