With the increasing climate change and energy crisis,accelerating the development and utilization of renewable energy has become the consensus of all countries throughout the world.The international competitiveness of a country's renewable energy products in the international market is a comprehensive reflection of the country's comparative advantages in production,consumption and international trade of renewable energy products.In this paper,we measured the long-term trend of the international competitiveness of China's renewable energy products in the context of the Belt and Road Initiative,by adopting the constant market share (CMS) model and revealed comparative advantage (RCA).The results indicate that:(1) the overall international competitiveness of China's renewable energy products has shown a downward trend,while the increase of the absolute value of export has covered the fact that China's renewable energy products have become less competitive;(2) the comparative advantages of different categories of renewable energy products vary greatly,and the comparative advantage of solar energy products is strong,whereas those of hydro-energy and geothermal energy products comparative advantages to some degrees;(3) the market agglomeration of China's renewable energy products has presented to the regional markets where the demand growth is fast such as in ASEAN and South Asia;(4) the growth effect is the main reason causing the fluctuation of the total export volume and,(5) the unreasonable structure is an important factor influencing the overall international competitiveness of China's export of renewable energy products.Finally,we proposed corresponding policy recommendations based on these findings.