One of the key problems of the sustainable high-quality development of the “Belt and Road” Initiative is to prevent the investment risk existing in the infrastructure construction with huge capital scale and long period. Based on the summary of the achievements reached more than expected in the past six years，aiming at the in-depth problems that exist in the field of long-term investment，the proposal of preventing long term investment risk of the “Belt and Road” through constructing the “road-zone-economic belt combination” was thus proposed. In this paper，the basic mechanism of the model was analyzed，and additionally based on the principle，which is，the balance between social overhead capital of infrastructure and corporate social capital decides the total output，three ways to construct “road-zone-economic belt combination” were also analyzed in this article.