The " Belt and Road " policy proposes that they construct six economic corridors by the land-based Silk Road Economic Belt and the 21st century oceangoing Maritime Silk Road which connect the Pacific and Indian Ocean in the Indochina Peninsula. The policy tries to upgrade the transport infrastructure to bridge the infrastructure gap, and enhance the trading connection between China and other countries. The coverage area of the initiative is primarily Asia and Europe, encompassing around 60 countries. Those participating countries have huge influence to the world economy, therefore this study used the GTAP model to predict the improvement in traffic infrastructure for the participating countries and non-participating countries. We can find that through the policy it can accelerate economic growth for the participating countries, but it will have negative effect on the real GDP for non-participating countries.