As two big countries in East-Asia, China and Korea have kept good economic cooperation since 1992, the year they established diplomatic relation. Saemangeum Project is one of the most costly national projects, which started in November 1989. This project is not only good for balanced development of areas in Korea and Korea’s economic growth, but also brought new opportunities for Sino-Korea economic cooperation. The development of Saemangeum brought new opportunities for China and Korea economic cooperation in many ways. The new opportunities are not only in the areas of investment, logistics, tourism and leisure, but also in the areas of new energy developing and agriculture. China and Korea should seize these rare opportunities, and promote Sino-Korea economic cooperation into a higher level in the principle of common development and mutual benefit.