The paper suggests to build three economic corridors of KunMing-Hanoi, KunMing-Bangkok, KunMing-Yangon, and analyzes their backgrounds, conditions, feasibilities and important strategic meanings for China and YunNan province. It elaborates the construction plans, implementation projects, construction opportunities, steps and risks. It provides important decision-making basis for international coopration of LanCang-Mekong River subregional.